Chapter 2, Problem 112CWP

Interpretation Introduction

Interpretation:

The symbol of different atom with atomic number and mass number are given. The number of protons and neutrons is to be calculated.

Concept introduction:

In a neutral atom, the number of protons and electrons are same and equal to the atomic number of that atom but in an ion, they are different in number depending on the charge on the ion.  The sum of the number of protons and number of neutrons is equal to the mass number of that atom or ion.

Number of neutrons is calculated using the formula,

$A=p+n$

Where,

• $A$ is atomic mass.
• $p$ is number of protons.
• $n$ is number of neutrons.