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WAEC Chemistry 2011 Paper

Question : 1

Total: 46

How many isotopes has hydrogen?

Solution:

Concept:

Isotopes of an element have the same number of protons but different numbers of neutrons.

Explanation:

Hydrogen has three naturally occurring isotopes.

^{1}_{1}\mathrm{H}

: Protium, with 0 neutrons.

^{2}_{1}\mathrm{H}

: Deuterium, with 1 neutron.

^{3}_{1}\mathrm{H}

: Tritium, with 2 neutrons.

Each isotope differs only in neutron number; therefore, hydrogen has three isotopes.

Answer:

B. 3

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