Question

1) Explain with examples a) Atomic number b) Mas number

Answer 1

Answer:

(i) Atomic number: The atomic number is the total number of protons present in the atom. For example, the atomic number of Mg is 12. It contains 12 protons and 12 electrons.

(ii) Mass number: It is the sum of the number of neutrons and the number of protons.

Answer 2

Answer:

(a)The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

(b) The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.

Explanation:

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