Question

explain the whole mass of atom is concentrated at centre​

Answer 1

Answer:

i hope i t helps

Explanation:

An atomic mass (symbol: ma) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons. Atomic mass can be expressed in grams. However, because each atom has a very small mass, this is not very helpful.

Answer 2

Answer:

nucleus can hold the proton so it is concentrated at centre