With the help of Tab. Is given below, find out the mass numbers of oxygen and sulphur atoms:
The mass number is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom.
(i) Mass number of oxygen = No. of protons + No. of neutrons = 8 + 8 = 16
Mass number of Oxygen is 16
(ii) Mass number of sulphur = No. of protons + No. of neutrons = 16 + 16 = 32
Mass number of sulphur is 32
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