7.4: Electron Configuration of Ions

Exercise \(\PageIndex{1}\)

For which of the following atoms is the 2+ ion diamagnetic in the ground state?

a. Ni        b. Fe        c. Zn        d. Mn        e. Cu

Answer

c. Zn

Exercise \(\PageIndex{2}\)

Which of the following elements in its 1+ ionic state has the ground state electron configuration [Kr]4d¹⁰?

a. Ru        b. Au        c. Ag        d. In        e. Cd

Answer

c. Ag

Exercise \(\PageIndex{3}\)

If the ground state electron configuration of an element is [Ar]3d¹⁰4s²4p⁵, what is the typical charge on the monatomic anion of the element?

a. 4+        b. 2+        c. 1-        d. 2-        e. 3-

Answer

c. 1-

Exercise \(\PageIndex{4}\)

What is the ground state electron configuration for Cr³⁺?

1. [Ar]
2. [Ar]3d⁷4s²
3. [Ar]3d¹4s²
4. [Ar]3d²4s¹
5. [Ar]3d³

Answer

e. [Ar]3d³

Exercise \(\PageIndex{5}\)

What is the ground state electron configuration for Sn²⁺?

1. [Kr]4d¹⁰5s²
2. [Kr]4d¹⁰5p²
3. [Kr]5s²
4. [Kr]4d¹⁰5s²5p²
5. [Kr]4d¹⁰5s²5p⁴

Answer

a. [Kr]4d¹⁰5s²

Exercise \(\PageIndex{6}\)

Which of the given ions have the same ground state electron configuration: S^2–, N^3–, Mg²⁺, and Br^–?

1. N^3– and Mg²⁺
2. S^2–, N^3–, and Br^–
3. S^2– and Br^–
4. Mg²⁺ and Br^–
5. S^2–, N^3–, Mg²⁺, and Br^–

Answer

a. N^3– and Mg²⁺

Exercise \(\PageIndex{7}\)

Which of the following has the same (total) number of electrons as Ar?

a. Na⁺        b. Ca²⁺        c. Ga³⁺        d. O^2-        e. none    

Answer

b. Ca²⁺

Exercise \(\PageIndex{8}\)

What is the ground-state electron configuration of the chloride ion?

1. 1s²2s²2p⁶
2. 1s²2s²2p⁶3s²3p²
3. 1s²2s²2p⁶3s²3p⁶
4. 1s²2s²2p⁶3s²
5. 1s²2s²2p⁶3s²3p⁴

Answer

Add texts here. Do not delete this text first.

Exercise \(\PageIndex{9}\)

What 2– ion has the following ground state electron configuration?

1. Oxide ion
2. Nitride ion
3. Fluoride ion
4. Sulfide Ion
5. Magnesium Ion

Answer

d. Sulfide Ion

Exercise \(\PageIndex{10}\)

What 2+ ion has the following ground state electron configuration?

a. Mn²⁺        b. Co²⁺        c. Ni²⁺        d. Cu²⁺        e. Ge²⁺

Answer

b. Co²⁺

Exercise \(\PageIndex{11}\)

Which of the following ions has the given ground state electron configuration?

a. Cd²⁺        b. Sr²⁺        c. Zn²⁺        d.Sn²⁺        None of these

Answer

d. Sn²⁺

Exercise \(\PageIndex{12}\)

The ground-state electron configuration of a Ni²⁺ ion is 1s²2s²2p⁶3s²3p⁶3d⁸ . Therefore, Ni²⁺ is

1. paramagnetic with two unpaired electrons.
2. diamagnetic.
3. paramagnetic with one unpaired electron.
4. paramagnetic with four unpaired electrons.
5. paramagnetic with five unpaired electrons.

Answer

a. paramagnetic with two unpaired electrons.

Exercise \(\PageIndex{13}\)

Which of the following cations has the same number of unpaired electrons as Fe²⁺?

a. Ni²⁺        b. Fe³⁺        c. Cr²⁺        d. Mn²⁺        e. Co²⁺

Answer

c. Cr²⁺