Which element has a mass number of 20 and contains 11 neutrons?

Copper

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Gallium

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Calcium

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Sodium

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Fluorine

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Solution

The correct option is D Fluorine
Mass number (A) = Number of protons + Number of neutron
$∴$ Number of proton = Mass number - Number of neutron
$∴$ Number of proton = $20 - 11 = 9$

So, here the number of protons is 9.
Fluorine contains 9 protons.

Thus, option D is correct.

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