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WAEC Chemistry 2016 Paper

Question : 2

Total: 50

Solution:

Concept:

An atom is written as

{}^{A}_{Z}\mathrm{X}

, where

A

is the mass number and

Z

is the atomic number.

Explanation:

The atomic number

Z

equals the number of protons.

Since the atom has 6 protons,

Z = 6

The mass number

A

is the sum of protons and neutrons.

Here,

A = 6 + 7 = 13

So the correct nuclear notation is

{}^{13}_{6}\mathrm{X}

Answer:

Option A:

{}^{13}_{6}\mathrm{X}

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