Question

An atom has the same number of electrons, protons and neutrons if the mass number is the atomic number of the element. ( double / triple )

Answer 1

Mass number:

1. If the mass number is double the atomic number of the element then the number of electrons, number of protons, and the number of neutrons is equal. This is because in an atom the number of electrons is always equal to the number of protons to maintain neutrality.
2. The mass number is equal to the sum of protons and neutrons. If the mass number is double the atomic number then it implies that the number of protons and neutrons are equal.

Example: In the case of Sulphur (S) atom, the mass number i.e. 32 is double the atomic number i.e. 16, therefore here the number of protons, electrons, and neutrons are the same.

Atomic number = 16, number of proton= 16, number of electron= 16

Mass number = 32, proton + neutron = 32

16 + neutron = 32

neutron = 32-16 = 16