The reason behind the difficulty for the measurement of second and third electron affinities of the element should be explained. Concept Introduction: First ionization energy: The ionization energy is the minimum energy required to remove the electron from an isolated atom which is in the gaseous state results to give gaseous ion with one positive charge. atom ( g ) → ion with positive charge ( g ) + electron Second ionization: Repeating the same process that is removal of another electron that is second electron from the resulting ion of first ionization is called second ionization. Third ionization energy: Removal of electron from ion that results from the second ionization is called third ionization which results to give ion with three positive charges which shows, three electrons gets removed from the atom and the energy associated with it is called third ionization energy. Cation: Removal of electron from the atom results to form positively charged ion called cation. Anion: Addition of electron to atom results to form negatively charged ion called anion. The net charge present in the element denotes the presence or absence of electrons in the element. Effective Nuclear Charge: It is the positive charge experienced by the valence electrons present in the element due to the screening of innermost electrons present near to the nucleus. Electron Affinity : The ability of the atom to accept the electron is called electron affinity.

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Chapter 4, Problem 4.129QP

Interpretation Introduction

Interpretation: The reason behind the difficulty for the measurement of second and third electron affinities of the element should be explained.

Concept Introduction:

First ionization energy:

The ionization energy is the minimum energy required to remove the electron from an isolated atom which is in the gaseous state results to give gaseous ion with one positive charge.

atom(g)→ion with positive charge(g) + electron

Second ionization:

Repeating the same process that is removal of another electron that is second electron from the resulting ion of first ionization is called second ionization.

Third ionization energy:

Removal of electron from ion that results from the second ionization is called third ionization which results to give ion with three positive charges which shows, three electrons gets removed from the atom and the energy associated with it is called third ionization energy.

Cation: Removal of electron from the atom results to form positively charged ion called cation.

Anion: Addition of electron to atom results to form negatively charged ion called anion.

The net charge present in the element denotes the presence or absence of electrons in the element.

Effective Nuclear Charge: It is the positive charge experienced by the valence electrons present in the element due to the screening of innermost electrons present near to the nucleus.

Electron Affinity: The ability of the atom to accept the electron is called electron affinity.

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