Question

1. The atom of an element A has 4 protons, 5 neutrons and 4 electrons. What is the atomic number and mass number of this atom?

Answer 1

Answer:

The Atomic Number of this atom is 4

The Mass number number of this atom is 9.

Explanation:

Atomic number refers to the number of proton present in the nucleus of the atom.

Here the number of proton is 4. Therefore, 4 will be the atomic number of this atom

Mass number refers to the sum of protons and neutrons in an atom.

Here, the number of protons is 4

Here, the number of neutrons is 5

Therefore, the mass number of this atom if 4 + 5 = 9.