Question

An atom has 30 protons and 30 neutrons. What is its mass number?

Answer 1

• No of protons=30
• No of neutrons=30

Mass number=No of protons+No of neutrons

$\\ \sf\longmapsto Mass\:No=30+30$

$\\ \sf\longmapsto Mass\:No=60$

Answer 2

Explanation:

Here,

Protons(p+)=30

Neutrons(N⁰)=30

We know,

Atomic mass(z)=(P+)+(N⁰)

=30+30

=60