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WAEC Chemistry 2020 Paper

Question : 44

Total: 49

The atomic number of an atom would be equal to its mass number if it

Solution:

Concept:

The atomic number equals the number of protons, while the mass number equals the total number of protons and neutrons.

Explanation:

Atomic number is

Z = \text{number of protons}

Mass number is

A = \text{number of protons} + \text{number of neutrons}

For these two values to be equal, the number of neutrons must be zero.

An atom with no neutrons is the only case where

Z = A

Answer:

C. does not contain neutrons

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