Chapter 2.4, Problem 2.4.2SR

Interpretation Introduction

Interpretation:

Among the isotopes, the unstable isotope has to be identified.

Concept Introduction

Atoms: Atoms consist of tiny particles called protons, neutrons and electrons. Proton and neutrons are present in the nucleus and the electron resides around the nucleus. The protons number will be same as the electrons count in the atom.

$\begin{array}{l}{\text{The element symbol : }}_{\text{Z}}^{\text{A}}\text{X,}\\ \text{where, A (mass number) = no}\text{.of protons + no}\text{.of neutrons}\text{.}\\ \text{ Z (atomic number) = no}\text{. of protons}\text{. (electrons = protons)}\text{.}\end{array}$

Nuclear stability: The nucleus is composed of protons and neutrons. The strongest nuclear force binds the particles tightly. Due to the repulsion of like charges, protons repels each other and they are so close to each other. But there are some short range attractions present between a proton and a proton, a proton and a neutron and a neutron and a neutron.

Neutron to proton ratio is the main factor which determines the stability of a nucleus