Question

The mass number is used to calculate the number of —————— in one atom of an element.

Answer 1

Answer:

Neutron

Explanation:

• Neutron is calculated by Mass Number -Number of protons.

Lets see an example

Take Magnesium (Z=12)

• Mass no=25

$\\ \sf\longmapsto Neutrons=25-12=13$

Answer 2

Answer:

The mass number is used to calculate the number of protons and neutrons in one atom of an element.

Explanation:

Mass number = protons + neutrons

$.$