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Answer the Following - SSC (English Medium) Class 8 - Science

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Question

Answer the following :

What is meant by atomic mass number ? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.

Solution

Atomic Mass Number : It is the sum of total number of protons and neutrons present in a nucleus.
Atomic mass number = number of protons + number of neutrons.

Atomic number = number of protons = number of electrons. It is denoted by Z.
Mass number = number of protons + number of neutrons. It is denoted by A.
For example : Carbon atom its, Number of proton = 6
Number of neutrons = 6
Number of electron = 6
Atomic number(Z) = number of protons = number of electrons = 6.
Mass number(A) = number of proton + number of neutrons = 6 + 6 =12.

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