Question 1

What species is represented by the following information?
 p+ = 17 n° = 18 e- = 18

Accepted Answer

A)  Cl
B)  Cl-
C)  Ar
D)  Ar+
E)  Kr

Question 2

How many moles of Kr are contained in 398 mg of Kr?

Accepted Answer

A)  4.75 × 10-3 moles Kr
B)  33.4 moles Kr
C)  2.11 × 10-4 moles Kr
D)  2.99 × 10-3 moles Kr
E)  1.19 × 10-4 moles Kr

Question 3

Give an example of a halogen.

Accepted Answer

The answer of Give an example of a halogen....

Question 4

Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances: 
Cr-50 49.9461 amu 4.35%
Cr-52 51.9405 amu 83.79%
Cr-53 52.9407 amu 9.50%
Cr-54 53.9389 amu 2.36%

Accepted Answer

A)  51.941 amu
B)  51.699 amu
C)  208.766 amu
D)  53.214 amu
E)  51.996 amu

Question 5

What does "X" represent in the following symbol?

Accepted Answer

A)  tin
B)  copper
C)  palladium
D)  niobium
E)  uranium

Question 6

Why do the isotopes of the same element have the same atomic size?

Accepted Answer

Isotopes only differ in the nu...

Question 7

When forming the nitride ion, nitrogen, N, will ________ electron(s) .

Accepted Answer

A)  gain one
B)  gain two
C)  gain three
D)  lose one
E)  lose two

Question 8

An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is ________.

Accepted Answer

A)  17O2- 
B)  17O2+ 
C)  19F+ 
D)  19F- 
E)  17Ne2+

Question 9

What species is represented by the following information? 
p+ = 47 n° = 62 e- = 46

Accepted Answer

A)  Ag+
B)  Nd
C)  Pd
D)  Ag
E)  Pd+

Question 10

How many silver atoms are contained in 3.75 moles of silver?

Accepted Answer

A)  6.23 × 1024 silver atoms
B)  2.26 × 1024 silver atoms
C)  1.61 × 1023 silver atoms
D)  2.44 × 1026 silver atoms
E)  6.50 × 1025 silver atoms

Question 11

Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: 
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%

Accepted Answer

A)  46.26 amu
B)  45.91 amu
C)  46.34 amu
D)  46.84 amu
E)  44.99 amu

Question 12

Which of the following elements is a noble gas?

Accepted Answer

A)  Ar
B)  Br
C)  N
D)  O
E)  K

Question 13

When forming an ion, fluorine, F, will ________ electron(s) .

Accepted Answer

A)  gain one
B)  gain two
C)  gain three
D)  lose one
E)  lose two

Question 14

What mass (in mg) does 2.63 moles of nickel have?

Accepted Answer

A)  44.8 mg
B)  2.23 × 104 mg
C)  129 mg
D)  3.56 × 105 mg
E)  1.54 × 105 mg

Question 15

How many electrons does the Al3+ ion possess?

Accepted Answer

A)  16
B)  10
C)  6
D)  0
E)  13

Question 16

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

Accepted Answer

A)  F-, Ne, Mg2+
B)  Ge, Se2-, Br-
C)  K+, Rb+, Cs+
D)  Br, Br-, Br+

Question 17

What element is defined by the following information?
 p+ = 17 n° = 20 e- = 17

Accepted Answer

A)  calcium
B)  rubidium
C)  chlorine
D)  neon
E)  oxygen

Question 18

What is the chemical symbol for copper?

Accepted Answer

A)  Co
B)  Cr
C)  Cu
D)  C

Question 19

Which of the following elements is classified as a semimetal?

Accepted Answer

A)  calcium
B)  boron
C)  fluorine
D)  uranium

Question 20

Which of the following describes a metal?

Accepted Answer

A)  Poor conductor of heat
B)  Good conductor of electricity
C)  Tends to gain electrons
D)  Forms ionic compounds with group 18 elements
E)  Found on the upper right corner of the periodic table

Exam 2: Atoms and Elements

Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances: Cr-50 49.9461 amu 4.35% Cr-52 51.9405 amu 83.79% Cr-53 52.9407 amu 9.50% Cr-54 53.9389 amu 2.36%

Correct AnswerverifiedShow Answer

Why do the isotopes of the same element have the same atomic size?

Correct AnswerverifiedIsotopes only differ in the nu...View AnswerShow Answer

What species is represented by the following information? p+ = 47 n° = 62 e- = 46

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How many moles of Kr are contained in 398 mg of Kr?

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How many electrons does the Al3+ ion possess?

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What species is represented by the following information? p+ = 17 n° = 18 e- = 18

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What mass (in mg) does 2.63 moles of nickel have?

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An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is ________.

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What does "X" represent in the following symbol?

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Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

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Which of the following elements is classified as a semimetal?

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Which of the following elements is a noble gas?

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When forming an ion, fluorine, F, will ________ electron(s) .

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How many silver atoms are contained in 3.75 moles of silver?

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What is the chemical symbol for copper?

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What element is defined by the following information? p+ = 17 n° = 20 e- = 17

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Give an example of a halogen.

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When forming the nitride ion, nitrogen, N, will ________ electron(s) .

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Which of the following describes a metal?

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

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Isotopes only differ in the nu...
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What species is represented by the following information? p⁺ = 47 n° = 62 e^- = 46

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How many electrons does the Al³⁺ ion possess?

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What species is represented by the following information? p⁺ = 17 n° = 18 e^- = 18

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What element is defined by the following information? p⁺ = 17 n° = 20 e^- = 17

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