Question

B) Give Scientific reasons : (Any 1)
1) Atom is electrically neutral.
2) Atomic mass number is a whole number.
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Answer 1

Explanation:

1)The amount of charge on a single proton is equal to the amount of charge possessed by a single electron. A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral.

2)Atomic Number and Mass Number. Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons). The sum of the mass number and the atomic number for an atom (A-Z) corresponds to the total number of subatomic particles present in the atom.

Answer 2

Explanation:

The mass number (A), also called atomicmass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Hence it can only be a natural number which is a whole number (can not be zero)