Question

what is rule to find mass no. of any element

Answer 1

Answer:

Do neutrons + protons

Explanation:

Method 1

Add neutrons and protons of that element.

Method 2

Double the atomic number, atomic mass will be around this.

( Method 1 is most appropriate one )

Thank you.

Answer 2

Answer:

Mass Number:

The sum of the number of proton and neutron or the sum of the number of electron and neutron is called mass number.

Formula:

Mass Number = Proton + Neutron

Or

Mass Number = Electron + Neutron