Chemistry 2
14) Which element has a variable charge? A) Na B) Fe C) Al D) C
B) Fe
43) How many total valence electrons does the polyatomic ion OBr- possess? A) 11 B) 12 C) 13 D) 14 E) 15
D) 14
27) Which bond is the MOST polar? A) C-N B) C-O C) C-C D) C-Cl E) C-F
E) C-F
57) Atoms with three valence electrons generally form five bonds. True or False
False
98) The chemical formula for phosphorus pentachloride is ________.
PCl5
98) The electron configuration of the oxide ion is ________.
1s22s22p6
95) In the Lewis structure of a molecule, oxygen atoms typically have ________ lone pair(s) of electrons.
2
27) What is the chemical formula of tin (IV) cyanide? A) Sn4CN B) SnCN4 C) Sn(CN)4 D) SnC4N4
C) Sn(CN)4
8) Which of the statements concerning chemical bonds is false? A) The sharing of electrons between two nonmetal atoms results in a covalent bond. B) The attraction between oppositely charged ions results in an ionic bond. C) The term nonpolar is used to describe a covalent bond in which electrons are not shared equally. D) A bond dipole is the separation of charge that results when atoms sharing electrons have different electronegativities.
C) The term nonpolar is used to describe a covalent bond in which electrons are not shared equally.
) What is the molecular shape around the oxygen atom in the structure shown below? A) linear B) bent C) trigonal planar D) tetrahedral E) trigonal pyramidal
B) bent
35) What is the molecular shape around the nitrogen atom in the structure shown below? A) linear B) bent C) trigonal planar D) tetrahedral E) trigonal pyramidal
B) bent
31) Which bond has the polarity incorrectly labeled? A) δ+ H-Cl δ- B) δ+ O-C δ- C) δ+ Cl-F δ- D) δ- Cl-Br δ+ E) δ- F-O δ+
B) δ+ O-C δ-
52) The covalent bond between chlorine and iodine is a polar one. Which of the following properly represents the direction of polarity in this bond? A) δ+ Cl-I δ- B) δ- Cl-I δ+ C) + Cl-I - D) - Cl-I +
B) δ- Cl-I δ+
3) In bonding, main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table. A) gain electrons B) lose electrons C) share electrons D) gain, lose, or share electrons
D) gain, lose, or share electrons
96) The chemical formula for iron (III) bicarbonate is ________.
Fe(HCO3)3
97) The formula for the ammonium ion is ________.
NH4+
Dibromomethane (CH2Br2) is a nonpolar molecule. True or False
false
55) A Lewis structure shows the connectivity between atoms in a molecule, as well as where all the bonding and nonbonding valence electrons reside. True or False
True
56) Bonding is the joining of two atoms in a stable arrangement. True or False
True
57) Atoms with three valence electrons generally form five bonds. True or False
True
57) Bonding is the joining of two atoms in a stable arrangement. True or False
True
58) Atoms with seven valence electrons typically form one covalent bond. True or False
True
61) A double bond consists of four electrons shared between two atoms. True or False
True
61) Ionic compounds have very high melting points compared to covalent compounds. True or False
True
62) All ionic compounds are soluble in water. True or False
True
62) The Lewis structure for BH3 contains an atom that does not follow the octet rule. True or False
True
64) Resonance structures for a substance differ only in the location of multiple bonds and the position of lone electron pairs. True or False
True
67) The symbol for the nitrite ion is NO2-. True or False
True
69) Unequal sharing of electrons in a covalent bond results in a polar bond. True or False
True
70) Nonpolar molecules may contain polar bonds. True or False
True
71) Some covalent compounds are solids, some are liquids, and some are gases at room temperature. True or False
True
72) C-H bonds are considered to be nonpolar, because the electronegativity difference between carbon and hydrogen is small. True or False
True
73) The symbol δ- is given to the more electronegative atom in a polar bond. True or False
True
76) In the valence shell electron pair repulsion (VSEPR) theory, a group is defined as an atom or a lone pair of electrons. True or False
True
77) A molecule that contains only one polar bond is a polar molecule. True or False
True
79) A resonance hybrid is a composite of all resonance structures that spreads out electron pairs in multiple bonds and lone pairs. True or False
True
84) An iodide ion has 53 protons and 54 electrons. True or False
True
85) Strontium and barium form ions with the same charge. True or False
True
87) In crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced. True or False
True
88) The formula for stannic fluoride is SnF4. True or False
True
89) The chemical formulas of ionic compounds are written with the cation first, and then the anion, with subscripts to show how many of each are needed to have zero net charge. True or False
True
91) The molecular shape around the boron atom in BCl3 is different than the molecular shape around the nitrogen atom in NCl3. True or False
True
100) To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper, a solid line is used for the two bonds in the plane of the paper; a ________ is used to show a bond that extends in front of the plane; and a ________ is used to show a bond that extends behind the plane.
wedge; dashed line
44) Which compound has the highest melting point? A) KCl B) CH4 C) C6H12O6 D) H2O
A) KCl
38) What is the correct formula for the ionic compound formed from the cation X3+ and the anion Y2- that results in zero overall charge? A) X2Y3 B) X2Y C) X3Y2 D) XY3
A) X2Y3
39) If atoms with the electron-dot symbols shown below are combined, what is the formula of the ionic compound that is formed? ( x 2 dots, y 6 dots) A) XY B) X2Y C) XY2 D) X2Y2 E) X3Y2
A) XY
1) Which is NOT an ionic compound? A) KCl B) Ca(NO3)2 C) CBr4 D) AlBr3
C) CBr4
17) Which pair of elements will form an ionic compound? A) Sulfur and oxygen B) Copper and iron C) Iron and chlorine D) Bromine and oxygen
C) Iron and chlorine
19) What is the formula for the ionic compound lithium oxide? A) LiO B) LiO2 C) Li2O D) Li2O2
C) Li2O
33) Which chemical formula is correct? A) Ag(CH3CO2)2 B) K2CN C) Mg(OH)2 D) MgHCO3 E) More than one of the formulas is correct.
C) Mg(OH)2
11) What is the symbol for the ion formed by magnesium? A) Mg2- B) Mg3+ C) Mg2+ D) Mg4-
C) Mg2+
43) The correct name for Ag2O is ________. A) silver (II) oxide B) silver (I) oxide C) silver oxide D) disilver oxide
C) silver oxide
2) Which is NOT a covalent compound? A) Br2 B) NO2 C) NH3 D) NaNO2 E) More than one of the compounds is not a covalent compound.
D) NaNO2
49) The diphosphate ion is a biologically important polyatomic ion. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate ion? A) P2O72- B) PO4- C) 2 PO46- D) P2O74-
D) P2O74-
40) Which group of the Periodic Table does not typically form ions? A) Group 1A B) Group 2A C) Group 6A D) Group 7A E) Group 8A
E) Group 8A
54) Neutral atoms always contain an equal number of protons, neutrons, and electrons. True or False
False
63) An ionic compound is a pure substance formed by chemically combining two or more nonmetal atoms together. True or False
False
72) Sodium nitrate and sodium nitrite are two acceptable names for the same compound. True or False
False
The ion symbol for the ferric ion is Fe2+. True or False
False
50) Anions are formed when a neutral atom gains one or more electrons. True or False
True
51) Cations are smaller in size than the atoms from which they are formed. True or False
True
69) Elements in group 2A form ions with a +2 charge. True or False
True
70) Ionic compounds are usually solids at room temperature. True or False
True
71) The formula for copper (II) hydroxide is Cu(OH)2. True or False
True
94) The electrons in the outermost occupied shell of an atom are called the ________ electrons.
octet
53) The Lewis structure of formaldehyde is shown below. Which statement concerning this structure is INCORRECT? A) Two electrons are being shared between the carbon atom and the oxygen atom. B) The oxygen atom has four valence electrons that are not being shared with another atom. C) The oxygen and carbon atoms each have an octet of electrons in their valence shells. D) The hydrogen atoms have filled valence shells.
A) Two electrons are being shared between the carbon atom and the oxygen atom.
16) Identify the correct name for the compound NO2. A) Nitrogen oxide B) Dinitrogen monoxide C) Nitrogen dioxide D) Nitrogen oxate E) Nitrate
B) Dinitrogen monoxide
30) What is the correct chemical formula of selenium dioxide? A) SO2 B) SeO2 C) Se2O D) OS2
B) SeO2
6) What is the electron configuration of an F- ion? A) 1s22s22p4 B) 1s22s22p5 C) 1s22s22p6 D) 1s22s22p63s1
C) 1s22s22p6
9) How many covalent bonds are generally formed by atoms with five valence electrons? A) 1 B) 2 C) 3 D) 4 E) 5
C) 3
29) Aspartic acid is an amino acid used to synthesize proteins. How many polar bonds are in the aspartic acid structure shown below? A) 4 B) 6 C) 9 D) 12 E) 15
C) 9
50) Which statement concerning chemical bonds is FALSE? A) A covalent bond involves the sharing of electrons between two nonmetal atoms. B) An ionic bond is the attraction between oppositely charged ions. C) A nonpolar bond is a covalent bond in which electrons are not shared equally between the atoms. D) Electronegativity is a measure of the attraction an atom has for the electrons it shares in a bond.
C) A nonpolar bond is a covalent bond in which electrons are not shared equally between the atoms
49) Which of the statements concerning compounds is INCORRECT? A) Compounds are formed when atoms of two or more different elements are chemically bonded. B) Ionic compounds are composed of cations and anions. C) Covalent compounds are composed of metals and nonmetals. D) Covalent compounds are composed of individual molecules.
C) Covalent compounds are composed of metals and nonmetals.
38) Which molecule or ion has ONLY two resonance structures to describe its bonding? A) CO32- B) NO3- C) HCO31- D) SO3
C) HCO31-
5) Which of the following compounds is classified as covalent? A) KCl B) LiBr C) HCl D) NaBr E) None of the choices are correct.
C) HCl
99) Carbon tetrachloride has ________ valence electrons. A) 4 (four) B) 8 (eight) C) 24 (twenty-four) D) 32 (thirty-two) E) 40 (forty)
D) 32 (thirty-two)
45) How many lone pairs of electrons need to be added to the Lewis structure of carbonic acid shown below? A) 0 B) 3 C) 4 D) 6 E) 7
D) 6
22) Aspartic acid is an amino acid used to synthesize proteins. How many lone pairs of electrons need to be added to complete the aspartic acid structure shown below? A) 4 B) 6 C) 8 D) 9 E) 11
D) 9
23) Which of the following molecule(s) is(are) polar? A) CO2 B) CH4 C) CBr4 D) CHBr3 E) More than one of the molecules are polar.
D) CHBr3
25) Rank the atoms Br, Cl, and F in order of increasing electronegativity. A) F < Br < Cl B) Cl < Br < F C) Br < Cl < F D) F < Cl < Br E) Cl < F < Br
D) F < Cl < Br
7) What is another name for an unshared pair of electrons in a covalent compound? A) Lone pair of electrons B) Nonbonded electron pair C) Bonding pair of electrons D) Lone pair of electrons or nonbonded electron pair
D) Lone pair of electrons or nonbonded electron pair
54) A molecule is a discrete group of atoms held together by covalent bonds. True or False
True
65) The name of an anion usually ends in the -ide if it is derived from a single atom or -ate (or -ite) if it is polyatomic. True or False
True
94) Electronegativity ________ down a column of the periodic table as the atomic radius increases.
decreases
100) In bonding, main group elements gain, lose, or share electrons to attain the ________ of the nearest noble gas neighbor to them in the periodic table.
electron configuration
99) The Ca2+ ion contains ________ protons. A) 20 B) 18 C) 22 D) 40 E) 2
A) 20
42) How many total valence electrons does the polyatomic ion NH4+ possess? A) 8 B) 9 C) 10 D) 11 E) 7
A) 8
5) Which statement concerning the ion Li+ is correct? A) Li+ has two total electrons. B) Li+ has an octet of electrons in its valence shell. C) Li+ is formed when a lithium atom gains one electron. D) Li+ is formed when a lithium atom gains one proton.
A) Li+ has two total electrons.
93) Ionic bonds form between a metal on the ________ side of the periodic table and a nonmetal on the ________ side.
left , right
93) In general, a ________ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.
polar
101) Carbon usually forms four bonds in stable molecules. However unstable carbon compounds with less than four bonds are known. The methyl carbanion shown below is an example. The molecular shape around the carbon atom in this structure is ________.
trigonal pyramidal
94) The electrons in the outermost occupied shell of an atom are called the ________ electrons.
valence
3) Identify the diatomic element from the given choices. A) Chlorine B) Carbon C) Boron D) Sulfur E) Lithium
A) Chlorine
24) Rank the atoms Br, Cl, and K in order of increasing electronegativity. A) K < Br < Cl B) Cl < Br < K C) Br < Cl < K D) K < Cl < Br E) Cl < K < Br
A) K < Br < Cl
17) Which choice would be named dinitrogen pentoxide? A) N2O5 B) N5O2 C) N3O2 D) N2O3 E) NO
A) N2O5
12) How many lone pairs of electrons are present in the Lewis structure of ammonia, NH3? A) 0 B) 1 C) 2 D) 3 E) 4
B) 1
34) Estimate the bond angles around the sulfur atom in the structure shown below. A) 90° B) 109.5° C) 120° D) 180°
B) 109.5°
15) How many valence electrons are in a molecule of formaldehyde (CH2O)? A) 16 B) 12 C) 10 D) 8 E) 0
B) 12
19) Predict the bond angles around the carbon atom in the structure of carbonic acid shown below. Don't forget to draw in lone pairs where needed to give octets. A) 180° B) 120° C) 109.5° D) 90° E) 60°
B) 120°
10) How many covalent bonds are generally formed by an oxygen atom? A) 1 B) 2 C) 3 D) 4 E) 5
B) 2
96) Aspartic acid is an amino acid used to synthesize proteins. There are ________ atoms with a trigonal planar geometry in the aspartic acid structure shown here. A) 1 B) 2 C) 3 D) 4 E) 5
B) 2
13) How many nonbonded electron pairs are in the Lewis structure below? (CO2) A) 2 B) 4 C) 6 D) 8 E) 16
B) 4
40) Which molecule's Lewis structure contains an atom that violates the octet rule? A) H2O B) BeH2 C) PCl3 D) H2Se
B) BeH2
21) What are the bond angles in a tetrahedral geometry? A) 180° B) 120° C) 109.5° D) 90° E) 60°
C) 109.5°
28) Which bond is the LEAST polar? A) C-N B) C-O C) C-C D) C-Cl E) C-F
C) C-C
18) Which choice would be named carbon tetrachloride? A) CCl B) C4Cl C) CCl4 D) CCl3 E) C3Cl
C) CCl4
11) Which of the following elements will generally form only one covalent bond? A) Sulfur B) Carbon C) Hydrogen D) Argon E) Nitrogen
C) Hydrogen
32) What is the chemical formula for dinitrogen tetroxide? A) N4O2 B) O4N2 C) N2O4 D) O2N4 E) NO2
C) N2O4
4) Identify the diatomic element from the given choices. A) Phosphorus B) Helium C) Nitrogen D) Silicon E) Sodium
C) Nitrogen
6) Which of the following compounds is not classified as covalent? A) CH4 B) SF6 C) PBr3 D) MgCl2 E) None of the choices are correct.
D) MgCl2
37) Which element may have more than eight valence electrons around it when present in a covalent compound? A) C B) B C) N D) P E) O
D) P
26) Which atom has the lowest electronegativity? A) Al B) S C) Se D) Rb E) F
D) Rb
41) Which compound has the greatest number of valence electrons? A) H2S B) CH4 C) NH3 D) H2O E) All of the molecules have the same number of valence electrons.
E) All of the molecules have the same number of valence electrons.
39) Which of the following is classified as a group in the valence shell electron pair repulsion (VSEPR) theory? A) An atom B) A lone pair of electrons C) A valence electron D) Either an atom or a valence electron E) Either an atom or a lone pair of electrons
E) Either an atom or a lone pair of electrons
1) Covalent bonds result from the ________ electrons between two atoms. A) transfer of B) equal sharing of C) unequal sharing of D) Transfer of, equal sharing of, and unequal sharing of are correct. E) Equal sharing of and unequal sharing of are correct.
E) Equal sharing of and unequal sharing of are correct.
2) A diatomic molecule contains ________. I. atoms of two different elements bonded together with a covalent bond II. two atoms of the same element bonded together with a covalent bond III. two lone pairs of electrons A) I only B) II only C) III only D) I or II only E) I and III only
E) I and III only
44) Which atom(s) in the structure below has(have) a partial negative charge (δ-)? A) Carbon B) Fluorine C) Hydrogen D) Nitrogen E) Nitrogen and fluorine
E) Nitrogen and fluorine
20) What is the molecular shape around the phosphorus atom in PH3? A) Linear B) Bent C) Trigonal planar D) Tetrahedral E) Trigonal pyramidal
E) Trigonal pyramidal
59) Every atom must have an octet of electrons in order for a Lewis structure to be considered valid. True or False
False
60) Phosphorus usually forms two covalent bonds in a molecule. True or False
False
63) The Lewis structure for PH3 contains an atom that does not follow the octet rule. True or False
False
65) There can be a no more than two resonance structures for a molecule. True or False
False
66) The correct name for SF6 is sulfur heptafluoride. True or False
False
67) The formula for dinitrogen pentoxide is N5O2. True or False
False
68) A bond formed between the elements hydrogen and bromine would be considered an ionic bond. True or False
False
78) Ethane (C2H6) is a polar molecule. True or False
False
82) Double bonds and triple bonds are never polar bonds. True or False
False
83) A N-O bond is more polar than a P-O bond. True or False
False
88) A double bond is counted as two groups in the valence shell electron pair repulsion (VSEPR) theory. True or False
False
92) In Lewis structures, fluorine atoms generally do not obey the octet rule.
False
4) ________ are negatively charged ions that have ________ electrons than protons. A) Anions; more B) Cations; more C) Anions; less D) Cations; less
A) Anions; more
24) What is the proper name for MgF2? A) Magnesium fluoride B) Magnesium (I) fluoride C) Magnesium (II) fluoride D) Magnesium difluoride
A) Magnesium fluoride
21) What is the formula for the ionic compound formed when magnesium and oxygen combine? A) MgO B) MgO2 C) Mg2O D) Mg2O2
A) MgO
32) Which chemical formula is NOT correct? A) Na2HCO3 B) NaNO3 C) Na2HPO4 D) Na2SO3 E) More than one of the formulas is not correct.
A) Na2HCO3
13) What is the ion symbol of the oxide ion? A) O2- B) O22- C) O2 D) O2+ E) O6-
A) O2-
9) What is the ion symbol for an atom with sixteen (16) protons and eighteen (18) electrons? A) S2- B) S C) Ar D) Ar2+ E) Ar2-
A) S2-
15) Consider the A atom and the A2- ion. Which will have the larger radius (size)? A) The A2- ion B) The A atom C) They will both have identical radii D) Impossible to determine
A) The A2- ion
29) What is the charge on the nickel ion in the compound NiCl2? A) +1 B) +2 C) +3 D) +4
B) +2
34) An atom has the electron-dot symbol shown below. If this atom is a main group element, what charge will it form in its ionic state? ( x 3 dots) A) -1 B) +3 C) -5 D) -3
B) +3
45) What is the charge on the chromium ion in the ionic compound CrCl3? A) +6 B) +3 C) -3 D) -6 E) Not enough information is given to determine the charge.
B) +3
22) What is the formula for the ionic compound formed when aluminum and sulfur combine? A) AlS B) Al2S3 C) AlS3 D) Al2S E) Al3S2
B) Al2S3
41) What period 4 element forms an ion with a -1 charge? A) Sulfur B) Bromine C) Iodine D) Rubidium E) Potassium
B) Bromine
7) What is the ion symbol for an atom with twenty (20) protons and eighteen (18) electrons? A) Ca B) Ca2+ C) Ar D) Ar2+ E) Ar2-
B) Ca2+
26) What is the chemical formula for the ionic compound calcium selenide? A) Ca2Se2 B) CaSe C) CaSe2 D) Ca2Se
B) CaSe
30) Which roman numeral correctly completes the name of the compound CrO? A) Chromium (I) oxide B) Chromium (II) oxide C) Chromium (III) oxide D) Chromium (IV) oxide
B) Chromium (II) oxide
23) What is the proper name for CuCl? A) Copper chloride B) Copper (I) chloride C) Copper (II) chloride D) Copper monochloride
B) Copper (I) chloride
48) What is the formula for chromous cyanide? A) CrCN B) Cr(CN)2 C) Cr(CN)3 D) Cr2CN
B) Cr(CN)2
18) What is the formula for the ionic compound formed when potassium and bromine combine? A) PBr B) KBr C) KBr2 D) K2Br E) K7Br
B) KBr
46) What is the formula for the ionic compound formed from the lead (II) ion and the carbonate ion? A) Pb(CO3)2 B) PbCO3 C) Pb2CO3 D) PbCO4
B) PbCO3
25) What is the name of the SO42- ion? A) Sulfide ion B) Sulfate ion C) Sulfite ion D) Bisulfate ion
B) Sulfate ion
16) Consider the B atom and the B+ ion. Which will have the larger radius (size)? A) The B+ ion B) The B atom C) They will both have identical radii D) Impossible to determine
B) The B atom
36) If atoms with the electron-dot symbols shown below are combined, what is the formula of the ionic compound that is formed? (x 1 dot, y 6 dots) A) XY B) X2Y C) XY2 D) X2Y2 E) X3Y2
B) X2Y
31) The formula for zinc acetate is ________. A) ZnCH3CO2 B) Zn(CH3CO2)2 C) Zn(HCO3)2 D) Zn(HCl)8
B) Zn(CH3CO2)2
28) What is the charge on the iron ion in the compound Fe2O3? A) +1 B) +2 C) +3 D) +4
C) +3
12) What is the charge of the ions formed by group 7A elements? A) +1 B) +7 C) -1 D) -7
C) -1
10) How many protons and electrons are present in Co2+? A) 27 protons, 27 electrons B) 27 protons, 29 electrons C) 27 protons, 25 electrons D) 29 protons, 27 electrons
C) 27 protons, 25 electrons
37) What is the correct formula for the ionic compound formed from the cation X2+ and the anion Y- that results in zero overall charge? A) X2Y B) XY C) XY2 D) X2Y2
C) XY2
47) The correct name for AuI3 is ________. A) silver iodide B) gold iodide C) gold (III) iodide D) gold iodide (III)
C) gold (III) iodide
56) Ionic compounds are composed of positively and negatively charged ions held together by strong electrostatic forces. True or False
True
73) Sodium bicarbonate and sodium hydrogen carbonate are two acceptable names for the same compound. True or False
True
77) If the main group element has an electron-dot symbol of (x 2 dots) , the charge of the resulting ion will be +2. True or False
True
78) If the main group element has an electron-dot symbol of (Z 6 dots) , the charge of the resulting ion will be -2. True or False
True
79) All polyatomic ions are anions. True or False
True
Potassium sulfide has the chemical formula K2S. True or False
True
51) Cations are smaller in size than the atoms from which they are formed. True or False
False
53) The (II) in the name of the ionic compound lead (II) acetate specifically indicates that there are two lead ions present in the compound. True or False
False
55) Ionic compounds are composed of individual molecules, discrete groups of atoms that share electrons. True or False
False
58) Ionic bonds result from the sharing of electrons between two atoms. True or False
False
59) A cation is positively charged, and has more electrons than the neutral atom. True or False
False
60) The ionic formula for zinc oxide is ZnO2. True or False
False
62) All ionic compounds are soluble in water. True or False
False
64) A polyatomic ion is an ion that forms more than one charge. True or False
False
66) The correct name for CaHPO4 is calcium phosphate. True or False
False
68) The noble gas that has the same electronic configuration as the iodide ion is krypton. True or False
False
74) The sulfite ion contains more oxygen atoms than the sulfate ion. True or False
False
75) The carbonate ion contains the same number of oxygen atoms as the sulfate ion. True or False
False
76) The electron configuration for the sulfide ion is 1s22s22p63s23p64s2. True or False
False
79) All p block elements form ions. True or False
False
79) All polyatomic ions are anions. True or False
False
83) An iron (III) ion has 29 protons and 26 electrons. True or False
False
90) A main group element is especially stable when it possesses eight total electrons. True or False
False
91) When magnesium forms an ion it gains two electrons. True or False
False
92) When forming an ion, an atom with the electron-dot symbol of ( X 3 dots) forms an anion with a -3 charge by the loss of three electrons.
False
42) What is the name of the compound (NH4)2SO4? A) Ammonium sulfide B) Ammonia sulfate C) Ammonia sulfoxide D) Ammonium sulfate E) Diammonium sulfate
D) Ammonium sulfate
20) Which statement best explains the basis for the octet rule? A) Atoms are most stable when they have eight bonds. B) Atoms lose, gain, or share electrons to become a stable, noble gas. C) Atoms are most stable with eight protons in their nucleus. D) Atoms are most stable with eight electrons in their valence shell and the electron configuration of a noble gas.
D) Atoms are most stable with eight electrons in their valence shell and the electron configuration of a noble gas.
8) When forming ions, metals typically do which of the following? A) Lose electrons to form negatively charged ions B) Gain protons to form cations C) Gain electrons to form anions D) Lose electrons to form positively charged ions
D) Lose electrons to form positively charged ions