General Chemistry

Practice

1.

What is the maximum number of electrons that can occupy one p orbital?
a.14
b. 2
c. 10
d.1
e. 6

answer

b. 2

2.

The n = 2 shell can accommodate a maximum of ____  electrons.
A. 10
B. 8
C. 4
D. 6
E. 2

answer

B.8

3.

Which of the following is an incorrect orbital occupancy representation?

  1. 4d3
  2. 3d5
  3. 2s3
  4. 1s1
  5. 2p2

 

answer

C. 2s3

4.

The maximum number of electrons that can be accommodated in 3s subshell is

  1. 10
  2.  2
  3. 6
  4. 1
  5. 8

 

answer

B. 2

5.

The following electron configuration is incorrect according to the Pauli exclusion principle:

  1. 1s22s2
  2. 1s22s32p3
  3. 1s22s22p5
  4. 1s22s22p4
  5. 1s22s22p63s2

 

answer

B. 1s22s32p3

6.

Which electron configuration represents an excited state of the indicated atom?

  1. He: 1s2
  2. Na: 1s2 2s2 2p6 3s2 3p2 3s1
  3. P: 1s2 2s2 2p6 3s2 3p3
  4. N: 1s2 2s2 2p23s1
  5. Ne: 1s2 2s2 2p6

 

answer

D. N: 1s2 2s2 2p23s1

7.

This element is in the p-block of the periodic table

  1. Cs
  2. In
  3. Pd
  4. He
  5. Po

 

answer

B. In

8.

Which of the following represents the ground state electron configuration of a transition element?

  1. 1s22s22p63s23p5
  2. 1s2 2s2 2p6 3s2 3p63d104s1
  3. 1s22s22p63s23p63d104s24p4
  4. 1s22s22p63s23p64s2
  5. 1s22s22p3

 

answer

B. 1s2 2s2 2p6 3s2 3p63d104s1

9.

Which of the following is the correct ground-state electron configuration of V is?

  1. 1s22s22p63s23p63d3
  2. 1s22s22p63s23p63d5
  3. 1s22s22p63s24s23d3
  4. 1s22s22p63s23p64s23d5
  5. 1s22s22p63s23p64s23d3

 

answer

E. 1s22s22p63s23p64s23d3

 

10.

Which of the following represents a possible excited-state electron configuration for an iron atom?

  1. [Ar]3d74s2
  2. [Ar]3d64s2
  3. [Ar]3d74s1
  4. [Ar]3d64s1
  5. [Kr]3d74s1

 

answer

C. [Ar]3d74s1

11.

Each of the following is an accurate representation of ground-state electron configuration except:

  1. Fe: [Ar]4s23d6.
  2. Ca: [Ar]4s2.
  3. Se: [Ar] 4s23d104p4.
  4. Ag: [Kr] 5s24d9.
  5. Ti: [Ar] 4s2 3d2
answer

D. Ag: [Kr] 5s24d9.

12.

How many electrons, in total, are present in p orbitals in a ground-state nickel atom?

  1. 8
  2. 12
  3. 6
  4. 24
  5. 3

 

answer

B. 12

13.

Which one of the following represents electron configuration of an excited carbon atom?

  1. 1s22s22p3
  2. 1s22s22p1
  3. 1s22s22p13s1
  4. 1s22s23s1
  5. 1s22s22p2

 

answer

C. 1s22s22p13s1

14.

Which of the following ground-state electron configurations is incorrect?

  1. Cl: [Ne]3s23p5
  2. Ge: [Ar] 4s2 3d103p2
  3. Co: [Ar]4s23d7
  4. Rb: [Kr]5s1
  5. Mn: [Ar] 4s23d5

 

answer

B. Ge: [Ar]4s2 3d103p2

15.

Bromine atom has ___ valence electrons.

  1. 6
  2. 4
  3. 7
  4. 5
  5. 35

 

answer

C. 7

16.

What is the ground-state electron configuration of chromium (Cr)?

  1. 1s22s22p63s23p63d104s24p64d105s25p4
  2. 1s2 2s2 2p6 3s2 3p6 4s1 3d5
  3. 1s22s22p63s23p63d10
  4. 1s2 2s2 2p6 3s2 3p6 4s23d4
  5. 1s2 2s2 2p6 3s2 3p63d6

 

answer

B. 1s2 2s2 2p6 3s2 3p6 4s1 3d5

17.

What is the ground-state electron configuration of bromine (Br)?

  1. 1s2 2s2 2p6 3s2 3p6 4s1 3d10 4p5
  2. [Kr] 4s23s104p5
  3. [Ne] 3s2 3p5
  4. [Ar] 4s23d104p5
  5. 1s2 2s2 2p5 3s2 3p6 4s2 3d10 4p5

 

answer

D. [Ar] 4s23d104p5

18.

The ground state electron configuration of As is ________.

  1. 1s22s23s23p64s23d104p2
  2. 1s22s22p63s23p64s23d104p1
  3. 1s22s22p63s23p64s23d104p3
  4. 1s22s22p63s23p64s23d104d3
  5. [Kr]4s23d104d3

 

answer

C. 1s22s22p63s23p64s23d104p3

19.

Which of the following elements has the same valence-shell electron configuration as lithium?

  1. calcium.
  2. sulfur.
  3. potassium.
  4. magnesium.
  5. argon.

 

answer

C. potassium

20.

How many unpaired electrons are found in the d orbital of nickel.

  1. 4 electrons
  2. 3 electrons
  3. 2 electrons
  4. 8 electrons
  5. none of these

 

answer

C. 2 electron

21.

The ground-state electron configuration of the element ________ is [Kr]5s24d10

  1. Fe
  2. Cd
  3. Cr
  4. Mn
  5. Zn

 

answer

B. Cd

22.

The ground-state electron configuration of ________ is [Ar]4s23d7.

  1. Ti
  2. Co
  3. Fe
  4. Cr
  5. Cs

 

answer

B. Co

23.

Chlorine has the following ground-state configuration:

  1. [He]3s23p2
  2. [Ne]3s23p5
  3. [He]2s22p5
  4. [Ne]2s22p3
  5. [He]3s23p5

 

answer

B.[Ne]3s23p5

24.

What is the maximum number of electrons that can be accommodated in each d-subshell?

  1. 10
  2. 5
  3. 6
  4. 3
  5. 2

 

answer

A.10

25.

The 3p subshell of a sulfur atom contains ________ electrons.

  1. 16
  2. 8
  3. 2
  4. 4
  5. 6

 

answer

D. 4

26.

What noble gas core should be used when writing the condensed electron configuration of Strontium (Sr)?

  1. [Xe]
  2. [Kr]
  3. [Ne]
  4. [Ar]
  5. [He]

 

answer

B. [Kr]

27.

Electron Configuration of Ions

 

Which of the following is the ground state electron configuration of S2-?

A) [Ne]
B) [Ne]3s23p6
C) [Ne]3s23p4
D) [Ne]3s23p2
E) [Ne]4s2

answer

B) [Ne]3s23p6

28.

A cation of +3 indicates that an element has

A) lost three neutrons.
B) lost three protons.
C) lost three electrons.
D) gained three protons.
E) gained three electrons.

answer

C) lost three electrons.

29.

Indicate the ground state electron configuration for Cl⁻.

A) 1s22s22p63s23p4
B) 1s22s22p63s23p5
C) 1s22s22p63s23p6
D) 1s22s22p63s13p6
E) 1s22s22p63s33p5

answer

C) 1s22s22p63s23p6

30.

Which of the following is the ground state electron configuration of Ba2+ ?

A) [Kr]5s24d105p66s2
B) [Kr]5s24d105p6
C) [Kr]5s24d105p65d2
D) [Kr]5s25p6
E) [Kr]5s24d105p66s2

answer

B) [Kr]5s24d105p6

31.

Which of the following is the ground state electron configuration of Ti2⁺.

A) [Ar]3d4
B) [Ar]3d2
C) [Ar]4s2
D) [Ar]4s23d4
E) [Ar]4s23d2

answer

B) [Ar]3d2

32.

Which of the following is the ground state electron configuration of Zn2⁺?

A) [Ar]4s23d6
B) [Ar]3d10
C) [Ar]4s23d8
D) [Ar]3d8
E) [Ar]

answer

B) [Ar]3d10

33.

Which of the following is the ground state electron configuration of Cr3⁺?

A) [Ar]
B) [Ar]4s13d2
C) [Ar]3d3
D) [Ar]4s23d1
E) [Ar]4s23d7

answer

C) [Ar]3d3

34.

How many valence electrons are present in the azide (N3-) ion?

A) 3
B) 5
C) 8
D) 7
E) 2

answer

C) 8

35.

Ca2+ has the following ground state electron configuration:

A) 1s22s22p6
B) 1s22s22p63s2
C) 1s22s22p63s23p2
D) 1s22s22p63s23p64s23d2
E) 1s22s22p63s23p6

answer

E) 1s22s22p63s23p6

36.

Rb+ has the following ground state electron configuration:

A) [Kr]5s24d6
B) [Kr]4s2
C) [Ar]4s24p4
D) [Kr]5s1
E) [Ar]4s23d104p6

answer

E) [Ar]4s23d104p6

37.

Which of the following is the ground state electron configuration of Fe3⁺?

A) [Ar]3d5
B) [Ar]4s13d3
C) [Ar]
D) [Ar]4s23d9
E) [Ar]4s23d1

answer

A) [Ar]3d5

38.

The correct ground state electron configuration for Br is:

A) [Ar]4s23d104p6
B) [Ar]4s23d104p3
C) [Ar]4s23d84p6
D) [Ar]4s23d104p5
E) [Ar]4s24p6

answer

A) [Ar]4s23d104p6

39.

How many electrons are present in the ground state of Mg2+ ion?

A) 2
B) 6
C) 10
D) 8
E) 12

answer

C) 10

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