Question

.. Give scientific reasons.
a. All the mass of an atom is concentrated
in the nucleus.
b. Atom is electrically neutral.
c. Atomic mass number is a whole number.
d. Atoms are stable though negatively
charged electron are revolving within it.
Define the following terms​

Answer 1

Explanation:

Answer: a. All the mass of an atom is concentrated in the nucleus because atom contains three subatomic particles like electron, proton and neutron. ... Atomic mass number is a whole number because it is the sum of numbers of protons and numbers of neutrons present in an atom.