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BECE Science 2011 Paper

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Question : 12

Total: 40

An atom has 6 protons and 7 neutrons in its nucleus. What is the mass number?

1
6
7
13

Solution:

Concept:

Mass number is the total number of protons and neutrons in the nucleus of an atom.

Explanation:

Number of protons

= 6

Number of neutrons

= 7

Mass number

= \text{Protons} + \text{Neutrons}

Mass number

= 6 + 7

Mass number

= 13

Answer:

The mass number is

13

, which is option D.

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