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Mass Number and Representation of Atom

The structure...

Question

The structure of sodium atom is shown in the figure given alongside. Identify the correct statement.
Sodium has atomic mass no :

A

11

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B

12

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C

23

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D

1

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Solution

The correct option is C 23
The mass number (A) is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.
Mass no. = 11 + 12 = 23

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