Chapter 2.1, Problem 1A

Summary Introduction

Introduction:

In the modern periodic table, elements are arranged according to their increasing atomic number. The symbol is derived as ${}_Z{}^{A}X$, where, X represents the chemical formula of the element present in the periodic table.

A is the atomic mass which is equal to the sum of the number of protons and number of neutrons.

Z is the atomic number which is equal to the number of protons.

A nucleus is defined as the sum of the number of neutrons and protons.

$\begin{array}{l}{p}^{+}\to proton \\ n^0\to neutron\\ e^{-}\to electron\end{array}$