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WAEC Physics 2010 Paper

Question : 49

Total: 50

^{70}_{32}X

has a neutron-proton ratio of

Solution:

Concept:

The neutron-proton ratio is found by dividing the number of neutrons by the number of protons in the nucleus.

Explanation:

For

^{70}_{32}\mathrm{X}

, the atomic number is

Z = 32

Therefore, the number of protons is

32

The mass number is

A = 70

Number of neutrons

= A - Z = 70 - 32 = 38

Now, neutron-proton ratio

= \frac{\text{neutrons}}{\text{protons}} = \frac{38}{32}

Simplifying,

\frac{38}{32} = 1.1875 \approx 1.2

Answer:

The neutron-proton ratio is

1.2

Correct option: C.

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