   Chapter 25.8, Problem 2.2ACP

Chapter
Section
Textbook Problem

What is the oxidation number of Tc in the pertechnetateion? What is the electron configuration of a Tcn+ ion with a charge equal to this oxidation number? Should the TcO4− ion be paramagnetic or diamagnetic?

Interpretation Introduction

Interpretation: The oxidation number of Tc in the pertechnetate ion, electronic configuration of a Tcn+ ion with a charge equal to the above mentioned oxidation number and its magnetic nature (diamagnetic or paramagnetic) has to be given.

Concept introduction:

The number of electrons an atom tends to give up or gain in a chemical reaction is called oxidation number.

• Rules for assigning oxidation number
1. 1. The oxidation number of the atom of an uncombined element is zero.
2. 2. The sum of the oxidation numbers of all atoms in a compound must equal to the total charge on the species.
3. 3. Hydrogen has an oxidation number of +1 unless it is combined with metals, in which case it has an oxidation number of -1.
4. 4. Oxygen has an oxidation number of -2, except in peroxides where it is -1 and in OF2 where it is +2.

Arrangement of electrons in the orbitals of an atom is called electronic configuration. Atom has sub atomic particles like electrons, protons and neutrons. Among which only the number of electrons is considered for electronic configuration.

The atom having unpaired electrons in their orbital is called paramagnetic. When it is having paired electrons is called diamagnetic.

Explanation

Formula for Pertechnetate ion is TcO4

Oxidation number of Tc can be determined as follows,

Oxidation number of Tc in Pertechnetate ion is +7

Electronic configuration of  Tc atom is [Kr]4d55s2

Electronic configuration of Tc7+ ion can be written as follows,

Seven electrons will be less in Tc7+ ion than Tc atom

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