Question

What is the mass number of element X which has 8 electrons and 8 neutrons?

• A. 16

Answer 1

The correct option is A 16
Mass number is the total number of protons and neutrons present in the nucleus of an atom. It is denoted by A.

For the given element X,
Number of electrons = 8
Number of electrons = Number of protons
Number of neutrons = 8
Mass number = Number of protons + number of neutrons
Therefore, mass number = 16