Question

0.2 Explain with example (i) Atomic number (ii) mass number​

Answer 1

Answer:

(1) Atomic number :-

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.

(2) mass number :-

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.

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Answer 2

Explanation:

Atomic number:

• The atomic number is the total number of protons present in the atom.

• For example, the atomic number of sodium is 11.

• It contains 11 protons and 11 electrons.

Mass number:

• It is the sum of the number of neutrons and the number of protons.

• For example, the atomic number of magnesium is 12 which is equal to the number of protons, the number of neutrons of magnesium is 12. The mass number is equal to 24.