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Nucleus: Common Terms

Deuterium is ...

Question

Deuterium is the most common isotope of hydrogen. How many neutrons does it have?

A

4

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B

3

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C

2

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D

1

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E

0

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Solution

The correct option is D 1
Deuterium : $_{1}^{2} H$
Mass number: $A = 2$
Atomic number (or number of protons), $Z = 1$
$∴$ Number of neutrons, $N_{n} = A - Z = 2 - 1 = 1$

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