Which of the following pairs of 'number - composition

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Which of the following pairs of 'number - composition' is correct?
I. Atomic number - number of protons
II. Mass number - Sum of number of neutrons and protons

[SSC CHSL 9th March 2023 Shift-4 With Answers]

A

Only I

B

Neither I nor II

C

Both I and II

D

Only II

EXPLANATION

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