Chemistry Homework 2

Which atoms have the same mass number? Check all that apply. 1. 126X and 126X 54 52 2. 134X and 126X 54 54 3. 134X and 134X 51 54 4. 126X and 126X 53 54 5. 126X and 134X 53 53

1. 126X and 126X 54 52 3. 134X and 134X 51 54 4. 126X and 126X 53 54

Determine the number of neutrons in each of the following atoms given the mass number and atomic number. Match the numbers in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. 1. An atom of potassium with a mass number of 39 and an atomic number of 19 has a total of __ neutrons. 2. An atom of fluorine with a mass number of 19 and an atomic number of 9 has a total of __ neutrons. 3. An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of __ neutrons. 4. An atom of phosphorous with a mass number of 31 and an atomic number of 15 has a total of __ neutrons. 5. An atom of oxygen with a mass number of 17 and an atomic number of 8 has a total of __ neutrons.

1. An atom of potassium with a mass number of 39 and an atomic number of 19 has a total of 20 neutrons. 2. An atom of fluorine with a mass number of 19 and an atomic number of 9 has a total of 10 neutrons. 3. An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of 11 neutrons. 4. An atom of phosphorous with a mass number of 31 and an atomic number of 15 has a total of 16 neutrons. 5. An atom of oxygen with a mass number of 17 and an atomic number of 8 has a total of 9 neutrons.

Complete the following chart: Drag each label to the appropriate target.

1. Symbol: oxygen-16, Number of Protons: 8, Number of Neutron: 8, Mass Number: 16 2. Symbol: oxygen-17, Number of Protons: 8, Number of Neutron: 9 , Mass Number: 17 3. Symbol: oxygen-18, Number of Protons: 8, Number of Neutron: 10, Mass Number: 18

In Part B, you classified the elements as metals, nonmetals, and metalloids (semimetals). Based on this classification, identify the position of the elements in the periodic table. Consider that the metals are always on the left-hand side of the periodic table, and nonmetals are on the right-hand side. Metalloids (semimetals) are placed in between these two groups. Drag the element symbol to its respective position in the periodic table. Drag the appropriate labels to their respective targets. S Ne Si Hg Ag

10: Ne 14: Si 16: S 47: Ag 80: Hg

Sort the following elements by the number of protons in an atom of each. Co Cn Cr Mg Mn Pr

12- Mg 24- Cr 25- Mn 27- Co 59- Pr 112- Cn

Which atoms have the same number of protons? 126X 52 126X 54 134X 54 134X 51 126X 53

126X 54 134X 54

Which atoms are isotopes? Check all that apply. 134X 54 126X 52 126X 53 126X 54 134X 51

134X 54 126X 54

Complete the fifth column of the table. Express your answers numerically separated by commas. Enter your answers in order given in the table.

19,23,48,56

Complete the third column of the table. Express your answers numerically separated by commas. Enter your answers in order given in the table.

19,23,56

Complete the fourth column of the table. Express your answer numerically.

28

Enter the appropriate symbol for an isotope of phosphorus-32 corresponding to the isotope notation A X Z Express your answer as a chemical symbol using isotope notation.

32 P 15

Complete the second column of the table. Express your answers as isotopes separated by commas. Enter your answers in order given in the table.

41K 19 112Cd 48 138 Ba 56

What is the symbol of another isotope of strontium with 51 neutrons?

89 Sr 38

What is the symbol of an isotope with the same mass number as in Part B and 50 neutrons? Express your answer as an isotope.

89 Y 39

What are the names of the elements symbolized by Ba, Na, and Fe, respectively?

Ba, Na, Fe= barium,sodium,iron

Match the atomic number to the element. 4 9 17 19 20 56

Beryllium- 4 Barium- 56 Chlorine- 17 Potassium- 19 Fluorine- 9 Calcium- 20

Rank these elements according to their ability to conduct electricity. Rank from best to worst conductor. To rank items as equivalent, overlap them. Cd Br Si

Best to worst: Cd, Si, Br

Identify the chemical symbols corresponding to each element. Drag the appropriate labels to their respective targets. Carbon Lead Antimony Sodium Aluminum

Carbon: C Lead: Pb Antimony: Sb Sodium: Na Aluminum: Al

A proton is attracted to a neutron because of their charges. True or False

False

Identify the atomic number and the chemical symbol for lead, silver, gold, and do not apply. symbol = Ag symbol = Ar symbol = Au symbol = Fe symbol = Pb atomic number = 18 atomic number = 26 atomic number = 47 atomic number = 79 atomic number = 82

Lead: atomic number = 82 symbol = Pb Gold: atomic number = 79 symbol = Au Silver: atomic number = 47 symbol = Ag Do not apply: atomic number = 18 symbol = Ar atomic number = 26 symbol = Fe

Enter the names for the elements in each of the following formulas of compounds used in health and medicine. antacid, Mg(OH)2

Magnesium,Oxygen,Hydrogen

Enter the names for the elements in each of the following formulas of compounds used in health and medicine. cathartic, MgSO4

Magnesium,Sulfur,Oxygen

Use these properties to classify the substances as metals, metalloids (semimetals), or nonmetals. Drag the appropriate elements to their respective bins. S Ne Si Hg Ag

Metals: Hg and Ag Metalloids: Si Nonmetals: Ne and S

Arrange the isotopes of oxygen and carbon in order of decreasing number of neutrons. Rank the isotopes from most to fewest neutrons. To rank items as equivalent, overlap them. C-12 C-13 C-14 C-16 O-16 O-18

Most Neurons to Least: C-16, O-18 C-14, O-16 C-13 C-12

For the following neutral atoms, give the number of protons, neutrons, and electrons: 81 Br 35

Np, Nn, Ne = 35,46,35

For the following neutral atoms, give the number of protons, neutrons, and electrons: 129 I 53 Enter your answers as integers separated by commas.

Np, Nn, Ne = 53,76,53

For the following neutral atoms, give the number of protons, neutrons, and electrons: 135 Cs 55

Np, Nn, Ne = 55,80,55

For the following neutral atoms, give the number of protons, neutrons, and electrons: 194 Pt 78

Np, Nn, Ne = 78,116,78

For the following neutral atoms, give the number of protons, neutrons, and electrons: 203 HG 80 Enter your answers as integers separated by commas.

Np, Nn, Ne = 80,123,80

How many protons, neutrons, and electrons are in 88 Sr 38

Np, Nn, Ne= 38,50,38

The diagram of a lithium atom is shown in Figure 1. Sort each of the items into the appropriate bin using the diagram of a neutral lithium atom for reference.(Figure 1) Drag each item to the appropriate bin: (Bins: Proton, Neutron, Electrons.) +1 charge no charge -1 charge approx the same mass as a neutron smallest mass of the three particles Labeled "A" Labeled "B" Labeled "C"

Proton: - particle labeled "B" - approximately the same mass as a neutron - +1 charge Neutron: - particle labeled "A" - no charge Electron: - -1 charge - smallest mass of the three particles - particle labeled "C"

Match the chemical symbol to the element. Si, S, C, Ca, Co, Cl, K, Na

Silicon- Si Chlorine- Cl Sulfur- S Cobalt- Co Sodium- Na Calcium- Ca Potassium- K Carbon- C

Enter the names for the elements in each of the following formulas of compounds used in health and medicine. astringent, AgNO3

Silver,Nitrogen,Oxygen

Enter the names for the elements in each of the following formulas of compounds used in health and medicine. treatment of thyroid hormone issues, NaI

Sodium,Iodine

A proton and an electron have opposite charges. True or False

True

Electrons repel each other. True or False

True

The nucleus contains most of the mass of an atom. True or False

True

Complete the first column of the table. Express your answers as strings separated by a comma. Enter your answers in order given in the table. See picture for table...

Vanadium,Cadmium

Identify the element of the isotopes selected in Part B. Express your answer as a chemical symbol. 134X 54 126X 54

Xe

What is the name of an atom with the same mass number as in Part B and 50 neutrons? Spell out the full name of the element.

yttrium How: The unknown atom has the mass number 89 and 50 neutrons. The atomic number can be found by subtracting the number of neutrons (50) from the mass number. Mass number 89 − number of neutrons 50 = atomic number 39 The unknown atom is yttrium.