Chemistry Chapter 2 An isotope with mass number 81 has eleven more

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62) The total numbers of neutrons, protons, and electrons in 31P3- are:

A) 15 neutrons, 31 protons, 15 electrons

B) 16 neutrons, 15 protons, 18 electrons

C) 31 neutrons, 15 protons, 18 electrons

D) 15 neutrons, 16 protons, 12 electrons

E) 16 neutrons, 16 protons, 18 electrons

63) The total numbers of neutrons, protons, and electrons in 35Cl– are ________.

A) 17 neutrons, 35 protons, 36 electrons

B) 35 neutrons, 17 protons, 18 electrons

C) 18 neutrons, 17 protons, 16 electrons

D) 18 neutrons, 17 protons, 18 electrons

E) 17 neutrons, 17 protons, 17 electrons

64) The total numbers of neutrons, protons, and electrons in 138Ba2+ are ________.

A) 138 neutrons, 56 protons, 54 electrons

B) 82 neutrons, 56 protons, 54 electrons

C) 56 neutrons, 82 protons, 80 electrons

D) 82 neutrons, 56 protons, 58 electrons

E) 82 neutrons, 82 protons, 82 electrons

65) A cation has 13 neutrons and 10 electrons. If it has a charge of +1, what is its correct symbol?

A)

B)

C)

D)

E)

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66) A cation has 28 neutrons and 21 electrons. If it has a +3 charge, what is its correct symbol?

A)

B)

C)

D)

E)

67) An anion has 45 neutrons and 36 electrons. If it has a -1 charge, what is its correct symbol?

A)

B)

C)

D)

E)

68) How many protons, neutrons, and electrons are in Mg2+?

A) 12 protons, 10 electrons, 12 neutrons

B) 12 protons, 12 electrons, 12 neutrons

C) 12 protons, 12 electrons, 24 neutrons

D) 24 protons, 10 electrons, 12 neutrons

E) 10 protons, 12 electrons, 24 neutrons

69) Write the appropriate symbol for the species containing 18 neutrons, 17 protons, and 16 electrons.

A)

B)

C)

D)

E)

70) What is the proper E notation for an ion having 35 protons, 36 electrons and 45 neutrons?

A)

B)

C)

D)

71) Write the symbol for the most common ion formed by sulfur.

A) S1-

B) S2-

C) S1+

D) S2+

E) requires experimental data

72) An isotope with mass number 81 has eleven more neutrons than protons. This is an isotope of what

element?

A) Tl

B) Yb

C) Zr

D) Br

E) Nb

73) The following ratios of masses were obtained with a mass spectrometer:

Cl/ F = 1.8406, F/ C = 1.5832

What is the mass of a Cl atom in atomic mass units?

A) 35.45 u

B) 36.36 u

C) 13.95 u

D) 35.00 u

E) 34.97 u

74) Copper occurs in an isotopic mixture of 69.09% 63Cu (mass = 62.93 u per atom) and 30.91% 65Cu

(mass = 64.93 u per atom). What is the average atomic mass of copper?

A) 64.00 u

B) 63.55 u

C) 63.45 u

D) 64.31 u

E) 29.00 u

75) There are two stable isotopes of supposium (Su).

Su-191 = 190.9609 u (27.30%) Su-194 = 193.9633 u (72.70%)

Compute the atomic mass of supposium.

A) 190.9 u

B) 194.0 u

C) 191.8 u

D) 192.5 u

E) 193.1 u

76) A new element is discovered. It has two isotopes. The relative abundance of the isotopes and their

masses are 18% isotope 1, mass 350.0 u and 82% isotope 2, mass 352.0 u. What is the atomic mass of the

element?

A) 351.6

B) 351.0

C) 350.4

D) 352.0

E) 350.0

77) Rubidium possesses two stable forms and has an average mass of 85.5. 85Rb has a mass of 84.9 and a

percent abundance of 72.2%. What is the mass of the other form of Rb?

A) 86.1 u

B) 85.7 u

C) 88.3 u

D) 87.1 u

E) 89.4 u

78) The three naturally occurring isotopes of magnesium are 24Mg (23.985042 u, 78.99%), 25Mg

(24.985837, 10.00%), and 26Mg. What is the atomic mass of 26Mg?

A) 25.98 u

B) 48.67 u

C) 23.94 u

D) 26.43 u

E) 24.31 u

79) The average atomic mass of B is 10.80 u. Boron has only two stable forms and

What is the natural percent abundance of B?

A) 80.0%

B) 20%

C) 1.0%

D) 3.8%

E) 75%

80) Silver possesses two stable isotopes: 107Ag (106.90 u) and 109Ag (108.90 u). If the average atomic

mass of Ag is 107.87 u, what is the percent abundance of 107Ag?

A) 48.5%

B) 50.0%

C) 51.5%

D) 46.3%

E) 53.8%

81) A certain element contains eleven atoms of mass 95.952 u for every four atoms of mass 98.949 u.

Compute the average atomic weight of this element.

A) 97.451 u

B) 96.751 u

C) 98.150 u

D) 105.16 u

E) 96.952 u

82) Calculate the percent abundance of the two isotopes of a fictional element, georgium, if it has an

average atomic mass of

Go-290 289.86 u

Go-292 292.07 u

A) Go-290, 38% and Go-292, 62%

B) Go-290, 62% and Go-292, 38%

C) Go-290, 42% and Go-292, 58%

D) Go-290, 58% and Go-292, 42%

E) cannot be determined

83) Magnesium has 3 stable isotopes with masses of 23.98504, 24.98584, and 25.98259 respectively. Mg-25

is 10.13%. What are the percentages of the other two isotopes?

A) 78.8% and 10.9%

B) 50% and 50%

C) 44.9% and 44.9%

D) 83.6% and 16.4%

E) 78.9% and 21.1%

84) Lead has 4 stable isotopes with masses of 203.973 (1.48%), 205.9745 (23.6%), 206.9759, and 207.9766

respectively. What are the percentages of the last two isotopes?

A) 77% and 23%

B) 50% and 50%

C) 37% and 38%

D) 64% and 11%

E) 24% and 50%

85) Iodine is a member of the family called ________.

A) metals

B) metalloids

C) noble gasses

D) halogens

E) actinides

86) Sodium is a member of the family called ________.

A) alkali metals

B) earth alkali metals

C) metalloids

D) actinide metals

E) transition metals

87) Main group elements are those in groups ________.

A) 1 and 2

B) 1, 2, and 13 to 18

C) 13 to 18

D) 1 and 18

E) 3 to 12

88) What is the average mass in kilograms of one atom of arsenic?

A) 74.922 kg

B) 0.074922 kg

C) 5.48 × 10–23 kg

D) 1.24 × 10–25 kg

E) 1.24 × 10–22 kg

89) What is the mass of a sample containing 1.2 moles of Ni?

A) 49 g

B) 59 g

C) 34 g

D) 61 g

E) 70 g

90) How many moles of Fe is present in 1.2 grams of Fe?

A) 2.15 × 10-2 mol

B) 0.215 mol

C) 4.30 × 10-2 mol

D) 2.15 × 10–1 mol

E) 0.430 mol

91) 24.9 g of Mn is equivalent to how many moles of Mn?

A) 2.21 moles

B) 0.453 moles

C) 0.461 moles

D) 0.996 moles

E) 1.00 mole

92) How many moles of lead are present in a piece of lead with a volume of 0.600 cm3? The density of Pb

is 11.34 g/cm3.

A) 6.80 moles

B) 0.0328 moles

C) 11.0 moles

D) 0.547 moles

E) 0.0912 moles

93) What is the density (g/cm3) of tin if 4.56 × 1020 atoms make a cube 2.31 mm on each side?

A) 0.00729 g/cm3

B) 169 g/cm3

C) 3.28 g/cm3

D) 0.0142 g/cm3

E) 7.29 g/cm3

94) What is the isotopic atomic mass of an isotope if 9.7023 × 1022 atoms weighs 4.0256 g?

A) 0.64858 g

B) 24.305 g

C) 24.986 g

D) 13.728 g

E) 4.0256 g

95) What is the atomic weight of an element if 4.00 grams of it contain atoms?

A) 20.2 u

B) 80.8 u

C) 19.7 u

D) 8.08 u

E) 2.02 u

96) A solution contains 12.5% NaCl by mass. What mass of solution is required to obtain Na

atoms?

A) 0.013 g

B) 30 g

C) 1.2 g

D) 95 g

E) 78 g

97) A lead cube that is 3.00 cm on each side contains atoms. What is the density of this cube in

g/cm3?

A) 34.1 g/cm3

B) 11.4 g/cm3

C) 0.0550 g/cm3

D) 0.990 g/cm3

E) 26.7 g/cm3

98) Lead-204 has a relative abundance of 1.48%. What size block of lead (in cubic centimeters) will contain

atoms of lead-204? The density of lead is 11.35 g/cm3.

A) 3.75 × 10–3 cm3

B) 0.253 cm3

C) 194 cm3

D) 17.1 cm3

E) 16.8 cm3

99) Lead-206 has a relative abundance of 23.6%. What size block of lead (in cubic centimeters) will contain

atoms of lead-206? The density of lead is 11.35 g/cm3.

A) 0.0107 cm3

B) 0.253 cm3

C) 1.07 cm3

D) 0.330 cm3

E) 12.1 cm3

100) What is the thickness in mm of the sheet formed by atoms of lead? The

density of lead is 11.35 g/cm3.

A) 9.10 mm

B) 0.0910 mm

C) 1.88 × 104 mm

D) 0.273 mm

E) 2.73 mm

101) An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has:

A) an atomic number of 21 and a mass number of 42

B) an atomic number of 20 and a mass number of 40

C) 22 neutrons and 20 protons

D) 22 protons and 20 neutrons

102) Which of the following represent isotopes?

A: X B: X C: X D: X

A) A and B

B) A and C

C) A and D

D) C and D

103) How many protons (p) and neutrons (n) are in an atom of Sr?

A) 38 p, 52 n

B) 38 p, 90 n

C) 52 p, 38 n

D) 90 p, 38 n

104) How many protons (p) and neutrons (n) are in an atom of barium-130?

A) 56 p, 74 n

B) 56 p, 130 n

C) 74 p, 56 n

D) 130 p, 56 n

105) What is the element symbol for an atom that has 5 protons and 6 neutrons?

A) B

B) C

C) H

D) Na

106) How many electrons are in a neutral atom of bromine-81?

A) 1

B) 35

C) 36

D) 81

107) Identify the chemical symbol of element Q in Q.

A) Br

B) Hg

C) Pd

D) Se

108) An atom of 131I contains ________ neutrons.

A) 53

B) 184

C) 78

D) 124

E) 131

109) The mass number of an atom of 14C is:

A) 6

B) 20

C) 8

D) 14

E) 10

110) What is the identity of element Q if the ion Q2+ contains 10 electrons?

A) C

B) O

C) Ne

D) Mg

111) How many electrons are in the ion P3-?

A) 12

B) 18

C) 28

D) 34

112) In which of the following sets do all species have the same number of electrons?

A) F–, Ne, Mg2+

B) Ge, Se2-, Br–

C) K+, Rb+, Cs+

D) Br, Br–, Br+

113) In which of the following sets do all species have the same number of protons?

A) F–, Ne, Mg2+

B) Ge, Se2-, Br–

C) K+, Rb+, Cs+

D) Br, Br–, Br+

114) Cesium belongs to the ________ group of the periodic table.

A) alkali metal

B) alkaline earth metal

C) halogen

D) noble gas

115) Iodine belongs to the ________ group of the periodic table.

A) alkali metal

B) alkaline earth metal

C) halogen

D) noble gas

116) Argon belongs to the ________ group of the periodic table.

A) alkali metal

B) alkaline earth metal

C) halogen

D) noble gas

117) Barium belongs to the ________ group of the periodic table.

A) alkali metal

B) alkaline earth metal

C) halogen

D) noble gas

118) Which of the following elements has chemical properties similar to tellurium?

A) fluorine

B) hydrogen

C) nitrogen

D) sulfur

119) Which of the following elements is a gas at room temperature?

A) bromine

B) carbon

C) helium

D) sodium