EBK CHEMISTRY
EBK CHEMISTRY
8th Edition
ISBN: 9780135216972
Author: Robinson
Publisher: PEARSON CO
Question
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Chapter 21, Problem 21.1P
Interpretation Introduction

Interpretation:

The electronic configuration of Mn, and the number of unpaired electrons in MnO2 is to be determined.

Concept introduction:

The filling of the electrons in the orbital can be done by the three sets of the principle are as follows:

(a). The Afbau principle:- This principle is stated that the lower energy of the orbital would be assigned electrons before the higher energy of the orbital.

(b). The Hund’s rule:-According to this rule, the pairing of the electrons can be done in the subshell after each of the subshells has a single electron.

(c). The Pauli’s exclusion principle:-This principle is stated that both electrons are present in either positive half-spin or negative half spin.

Expert Solution & Answer
Check Mark

Answer to Problem 21.1P

The electronic configuration of Mn4+ is shown below:

1s22s22p63s23p63d3

The number of unpaired electrons is present in the compound MnO2 is 3 that is in 3d orbital.

Explanation of Solution

The sum of the oxidation number of all the atoms that are present in the neutral compound is equal to zero.

Consider the oxidation number of Mn will be x. When oxygen is reacted with metal than the oxidation number of oxygen will be (2)

The oxidation number of Mn in MnO2 is calculated as follows:

(Oxidation number of Mn)+2(Oxidation number of O)=0

The value of the oxidation number of Mn is x.

The oxidation number of oxygen is 2.

Substitute the value in the above expression.

(x)+2(2)=0

Rearrange the above expression for x.

(x)=+4

Thus, the oxidation number of Mn in MnO2 is +4.

The atomic number of Mn is 25. The atomic number of the atom is equal to number electrons or number of the proton. Thus, the number of electrons is present in the manganese atom is 25. The electronic configuration of neutral Mn is represented below:

1s22s22p63s23p63d54s2

In the compound MnO2, the oxidation number of Mn is +4. This shows that Mn loses four electrons to attain Mn4+. The number of electrons are present in Mn4+ is 21. The two electrons are removed from s subshell and the other two electrons are removed from d subshell. The electronic configuration of Mn4+ is represented below:

1s22s22p63s23p63d3

The above electronic configuration of Mn4+ can be written in the form noble gas configuration is shown below:

[Ar]3d3

The number of unpaired electrons is present in the compound MnO2 is calculated as shown below:

The electronic configuration of Mn4+ is represented below:

[Ar]3d3

The structure of 3d3 orbital can be shown below:

3d31_ 1_ 1_ 0_ 0_

From the above structure of 3d3, there is three unpaired electrons are present.

Therefore, the number of unpaired electrons present in the compound MnO2 is 3.

Conclusion

The electronic configuration of Mn4+ is represented below:

[Ar]3d3

The number of unpaired electrons present in the compound MnO2 is 3.

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Chapter 21 Solutions

EBK CHEMISTRY

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