most chem quizzes and test for the final just press command find to search up the question
Which elements have properties similar to those of astatine (At) ?
F, Br , I
In the mineral beryl [BeAl2(SiO3)6], what is the ratio of beryllium to aluminum to silicate (SiO3)?
1:2:6
What is the electron configuration of an electrically neutral alkali metal?
1s22s1
How many valence electrons are found in phosphorus?
5
How many valence electrons does arsenic have?
5
How many valence electrons are in the outermost shell of all noble gases except helium?
8
How many valence electrons should you use to draw a Lewis structure of ammonia (NH3) ?
8
Fluorine has 7 valence electrons. Which statement is true about a fluorine molecule (F2) ?
A pair of electrons will be shared between the fluorine atoms.
Which ion would represent the ion of an element from Group 2A? Y3+? dont know what this is
A2+
A covalent compound has a pyramidal shape. What is the likely general formula of the molecule?
AX3
Which classification is the most specific for the element uranium?
Actinide-series element
The formula for aluminum fluoride is electrically neutral. What is the correct formula for this compound, which consists of only aluminum and fluoride ions? An aluminum ion has three positive charges.
AlF3
Which statement explains why the alkali metals are so highly reactive?
Alkali metals have one valence electron.
Which metalloid is a poison used in pesticides and insecticides?
As
Which metalloid is located in the sixth period of the periodic table?
At
What happens to the atomic size of the elements as one goes from the bottom to the top of a group?
Atomic size decreases as one moves from bottom to top in a group.
A salt forms in the reaction of barium with chlorine. What is the most likely formula unit of this salt?
BaCl2
Which element has the greatest first ionization energy?
C
Which phrase correctly describes a Lewis dot structure for carbon?
C with one dot on each of the four sides of the C
Which ion is not an oxyanion?
CN−
Which pairs of elements would most likely form a salt?
Ca and Br
What is the name of the compound with the formula CCl4 ?
Carbon tetrachloride
Copper (Cu) is a metal, nitrogen (N) is a nonmetal, and tellurium (Te) is a metalloid. Which answer shows these three elements in order of decreasing electrical conductivity?
Cu , Te , N
Which element is a metalloid?
Ge
Helium (He) has two valence electrons, and these electrons are located in the 1s subshell. Without using the periodic table, in which group and period is helium located?
Group 8A, Period 1
Which compound is a molecule?
H2
Which substance would have the highest melting point, based on electronegativity?
H2O
Which compound will likely have a bent triatomic structure?
H2S
How did Dmitri Mendeleev deal with elements that had not yet been discovered?
He left blanks for them in his periodic table, as he predicted they would be discovered.
Which substance has the strongest (London) dispersion forces?
I2
Which statement is true about the ionic size of the elements in a group as one moves from top to bottom in that group?
Ionic size increases from top to bottom within the group.
What happens when rubidium forms an ion?
It loses an electron and has an octet in the next-lowest energy level.
Which ions would have an electrostatic force of attraction between them?
K+ and O2−
Copper is a metal that is often formed into long, thin wires. Which property of metals makes this possible?
Metals are ductile.
Which statement is true?
Metals lose electrons to become cations.
Which metal is an alkaline earth metal?
Mg
Which ion came from an atom that lost two electrons?
Mg2+
Which notation represents the smallest atomic radius?
Mg2+
Which set of elements is in the order of decreasing conductivity?
Mn, Ge, O
Hydrogen bonds can be found between molecules of which substance?
NH3
Which compound is most likely to be a covalently bonded, polar compound?
NH3
Which ion is a polyatomic ion?
NH4+
Which compound has the highest boiling point?
NaCl
Sodium fluoride is a common ingredient in toothpaste. What is the most likely formula unit of this salt?
NaF
Which sentence describes one characteristic of nonmetals?
Nonmetals do not conduct electricity.
Which situation best describes an ionic bond?
One atom gains an electron while the other atom loses an electron, and an electrostatic force attracts them.
Which ion is an oxyanion?
PO43−
Which set of elements is in the order of increasing malleability?
Se, Sb, Sn
Which set of elements is in the correct order of increasing first ionization energy?
Si , P, S
Which property of silver does not explain why this metal is often used in jewelry?
Silver is a good conductor of electricity.
The ionization energies (kJ/mol) of hydrogen, nitrogen, sodium, chlorine, and fluorine are 1,312, 1,402, 496, 1,256, and 1,681, respectively. Which element is most likely to become a monoatomic ion with fluorine when these atoms interact?
Sodium
For ethane (C2H6) , what is the correct framework of the Lewis structure?
The central atoms consist of two carbons.
Which explanation accounts for why carbon monoxide is not a polar molecule?
The electronegativity differences between carbon and oxygen are not very large.
For the A groups (Groups 1A to 8A), how does the group number relate to the electron arrangement in atoms of the group?
The group number is equal to the number of valence electrons.
Why do ionic compounds have high melting points?
The strong electrostatic interactions between ions require a lot of energy to break the bonds.
How does dissolving an ionic compound in water increase electrical conductivity?
The water molecules electrostatically interact with the ions in the crystal and let the ions move freely.
Which statement is true about elements across a period on the periodic table?
They have different properties.
Which statement explains why ionic compounds are brittle?
When a force is applied to the crystal, the strong electrostatic interactions cause similar ions to repel and shatter the crystal lattice.
What does the periodic law state?
When elements are arranged in order of increasing atomic number, there is a recurring pattern to their physical and chemical properties.
Which compound contains a triple bond?
acetylene (C2H2)
What is the name of the group to which francium belongs?
alkali metal
Which group do sodium, potassium, and cesium belong to?
alkali metals
Which group has two valence electrons?
alkaline earth metals
Which element is most likely the best conductor of heat?
as
How is the modern periodic table arranged?
by increasing atomic number
What is the name of the compound CaCl2 ?
calcium chloride
Which substance tends to form anions when bonding with other elements?
chlorine
Which element has the most properties in common with molybdenum (Mo) ?
chromium (Cr)
Which intermolecular force is responsible for iodine (I2) being a solid at room temperature?
dispersion forces
Which element is a metal from the lanthanide series?
dysprosium (Dy)
Which element is a transuranium element?
einsteinium
Which element is only made in the laboratory?
fermium
Which rule determines the charge on a monatomic ion formed from a nonmetal?
groupnumber−8
Which property is a characteristic of an ionic compound?
high melting point
Where are the noble gases located on the periodic table?
in Group 8A (far right-hand side)
Where on the periodic table are the transition metals located?
in the middle
What was the key characteristic by which Dmitri Mendeleev arranged his periodic table?
increasing atomic mass
What is the primary characteristic by which the modern periodic table is arranged?
increasing atomic number
Which term best describes the element lanthanum?
inner transition metal
Which group contains mostly radioactive elements?
inner transition metals
Which type of elements are lanthanides and actinides part of?
inner transition metals
Which element is a metal?
iridium (Ir)
What is the correct name of the compound Pb(NO3)2 ?
lead (II) nitrate
What is the molecular shape of acetylene (H:C::::C:H) ?
linear
Which element has the same number of energy levels as aluminum (Al) and the same number of valence electrons as calcium (Ca) ?
magnesium (Mg)
Which naming rule would apply to CaCO3 ?
metal + polyatomic anion
What type of element is phosphorus?
nonmetal
What do Lewis structures show?
only valence electrons
Which element belongs to the p-block ?
oxygen
Which element combination will likely form polyatomic ions?
oxygen and carbon
Which element has four energy levels?
potassium (K)
Which element combination will likely form monatomic ions?
potassium and iodine
Which example is a brittle solid?
sulfur
Which element has the same number of valence electrons as oxygen (O) ?
sulfur (S)
Which element is a metalloid?
tellurium
In a compound that contains monatomic ions, what is named first?
the metal
What type of compound is iron (III) oxide?
transition metal ionic compound with nonmetal anion
Which element belongs to the d-block of the periodic table?
transition metals
What are elements with atomic numbers greater than 92 called?
transuranium
Which element is an inner transition metal?
uranium
