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Atomic Number

Identify whic...

Question

Identify which of the following element has a mass number of 20 and contains 11 neutrons?

A

Copper

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B

Gallium

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C

Calcium

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D

Sodium

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E

Fluorine

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Solution

The correct option is D Fluorine
Mass number of element, $A = 20$
Number of neutrons, $N_{n} = 11$
$∴$ Number of protons, $N_{p} = A - N_{n} = 20 - 11 = 9$
$⟹$ Atomic number, $Z = N_{p} = 9$
The element must be fluorine i.e $_{9}^{20} F$

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