The sum of protons and neutrons in the nucleus of an atom is known as ____?

ایٹم کے نیوکلئس میں پروٹان اور نیوٹران کا مجموعہ ____ کے نام سے جانا جاتا ہے؟

Atomic Mass

Mass Number

Atomic Number

Valance Number

The mass number (A) is the sum of protons and neutrons present in the nucleus of an atom.
It is a measure of the total number of nucleons (protons and neutrons) in the nucleus.