Question 1

An element with the electron configuration [noble gas]ns2(n − 1) d8 has ___________ valence electrons.

Accepted Answer

A)  2
B)  6
C)  8
D)  10
E)  None of these choices is correct.F) B) and E)
G) A) and E)

Question 2

Which element has the following ground-state electron configuration? [Kr]5s24d105p3

Accepted Answer

A)  Sn
B)  Sb
C)  Pb
D)  Bi
E)  TeF) A) and D)
G) A) and C)

Question 3

A magnesium ion, Mg2+, has

Accepted Answer

A)  12 protons and 13 electrons.
B)  24 protons and 26 electrons.
C)  12 protons and 10 electrons.
D)  24 protons and 22 electrons.
E)  12 protons and 14 electrons.F) A) and D)
G) All of the above

Question 4

How does atomic radius change as you move across the periodic table?

Accepted Answer

A)  Atomic radius decreases moving from left to right across a period and increases from top to bottom.
B)  Atomic radius increases moving left to right across a period and decreases from top to bottom.
C)  Smaller nuclear charge lowers energy; more electrons in an orbital lowers energy.
D)  Atomic radius increases diagonally across the periodic table.
E)  None of the answers is correct.F) B) and D)
G) A) and E) A

Question 5

Consider the element with the electron configuration [Kr]5s24d7.This element is

Accepted Answer

A)  a halogen.
B)  a transition metal.
C)  a nonmetal.
D)  an actinide element.
E)  a noble gas.F) A) and C)
G) C) and D) B

Question 6

Select the element that will lose an electron most easily, based on the periodic trend.

Accepted Answer

A)  Na
B)  Mg
C)  Ar
D)  PE) B) and C)
F) A) and B)

Question 7

Which of these elements has the greatest metallic character?

Accepted Answer

A)  Br
B)  Se
C)  Ni
D)  As
E)  SiF) C) and D)
G) B) and D)

Question 8

Which one of these ions has the smallest radius?

Accepted Answer

A)  Cl−
B)  K+
C)  S2−
D)  Na+
E)  O2−F) B) and D)
G) A) and D)

Question 9

How many electrons are in the 4p orbitals of selenium?

Accepted Answer

A)  0
B)  2
C)  4
D)  5
E)  6F) A) and E)
G) A) and D) C

Question 10

Which of the following elements has the largest number of unpaired electrons in the ground state?

Accepted Answer

A)  K
B)  V
C)  S
D)  Si
E)  ClF) B) and E)
G) C) and D)

Question 11

How many dots does the Lewis dot symbol for argon have around it?

Accepted Answer

A)  1
B)  2
C)  4
D)  6
E)  8F) C) and E)
G) B) and D)

Question 12

What element is represented by the electron configuration 1s22s22p63s23p64s23d104p65s14d10?

Accepted Answer

A)  Ag
B)  Rb
C)  Cd
D)  Sr
E)  CuF) None of the above
G) A) and E)

Question 13

An aluminum ion, Al3+, has

Accepted Answer

A)  13 protons and 13 electrons.
B)  27 protons and 24 electrons.
C)  16 protons and 13 electrons.
D)  13 protons and 10 electrons.
E)  10 protons and 13 electrons.F) A) and B)
G) B) and E)

Question 14

How many dots does the Lewis dot symbol for carbon have around it?

Accepted Answer

A)  4
B)  2
C)  6
D)  3
E)  7F) C) and D)
G) C) and E)

Question 15

How many orbitals can have the 3p description in a given atom?

Accepted Answer

A)  1
B)  2
C)  3
D)  5E) A) and B)
F) A) and C)

Question 16

Which of the following electron transitions would be expected to emit any light in the Bohr model of the atom?

Accepted Answer

A)  n = 1 to n = 4
B)  n = 3 to n = 1
C)  n = 2 to n = 3
D)  n = 5 to n = 7E) B) and C)
F) A) and B)

Question 17

The electron configuration of a ground-state Co atom is

Accepted Answer

A)  [Ar]4s23d7
B)  1s22s22p63s23d9
C)  [Ne]3s23d7
D)  [Ar]4s13d5
E)  [Ar]4s24d7F) A) and D)
G) A) and C)

Question 18

A sulfide ion, S2-, has

Accepted Answer

A)  16 protons and 16 electrons.
B)  32 protons and 16 electrons.
C)  16 protons and 14 electrons.
D)  16 protons and 18 electrons.
E)  32 protons and 18 electrons.F) A) and E)
G) A) and D)

Question 19

How many orbitals are there in the n = 4 level of the H-atom?

Accepted Answer

A)  4
B)  6
C)  8
D)  16
E)  18F) A) and D)
G) B) and C)

Question 20

Using the periodic table, predict the charge on the common ion of selenium.

Accepted Answer

A)  +1
B)  +2
C)  −1
D)  −2E) A) and C)
F) A) and B)

Exam 2: Electrons and the Periodic Table

An element with the electron configuration [noble gas]ns2(n − 1) d8 has ___________ valence electrons.

Correct AnswerverifiedShow Answer

Which element has the following ground-state electron configuration? [Kr]5s24d105p3

Correct AnswerverifiedShow Answer

A magnesium ion, Mg2+, has

Correct AnswerverifiedShow Answer

How does atomic radius change as you move across the periodic table?

Correct AnswerverifiedA

Consider the element with the electron configuration [Kr]5s24d7.This element is

Correct AnswerverifiedB

Select the element that will lose an electron most easily, based on the periodic trend.

Correct AnswerverifiedShow Answer

Which of these elements has the greatest metallic character?

Correct AnswerverifiedShow Answer

Which one of these ions has the smallest radius?

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How many electrons are in the 4p orbitals of selenium?

Correct AnswerverifiedC

Which of the following elements has the largest number of unpaired electrons in the ground state?

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How many dots does the Lewis dot symbol for argon have around it?

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What element is represented by the electron configuration 1s22s22p63s23p64s23d104p65s14d10?

Correct AnswerverifiedShow Answer

An aluminum ion, Al3+, has

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How many dots does the Lewis dot symbol for carbon have around it?

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How many orbitals can have the 3p description in a given atom?

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Which of the following electron transitions would be expected to emit any light in the Bohr model of the atom?

Correct AnswerverifiedShow Answer

The electron configuration of a ground-state Co atom is

Correct AnswerverifiedShow Answer

A sulfide ion, S2-, has

Correct AnswerverifiedShow Answer

How many orbitals are there in the n = 4 level of the H-atom?

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Using the periodic table, predict the charge on the common ion of selenium.

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An element with the electron configuration [noble gas]ns²(n − 1) d⁸ has ___________ valence electrons.

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Which element has the following ground-state electron configuration? [Kr]5s²4d¹⁰5p³

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A magnesium ion, Mg²⁺, has

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A

Consider the element with the electron configuration [Kr]5s²4d⁷.This element is

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B

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C

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What element is represented by the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹4d¹⁰?

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An aluminum ion, Al³⁺, has

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A sulfide ion, S^2-, has

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