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JAMB Chemistry 2022 Paper

Question : 6

Total: 40

Solution:

Concept:

The mass number of an atom is the sum of its protons and neutrons.

The atomic number equals the number of protons.

Explanation:

Given mass number

= 37

and atomic number

= 17

Number of protons

= 17

Use the relation:

\text{Mass number} = \text{Number of protons} + \text{Number of neutrons}

Rearrange to find neutrons:

\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}

Substitute the values:

\text{Number of neutrons} = 37 - 17 = 20

Answer:

The atom contains

20

neutrons.

Correct option: B. 20

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