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An element ‘X’ has mass number 24, and number of neutrons present in X is 12. What is the name element X?

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Manganese

Magnesium

Carbon

Chromium

answer is B.

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Detailed Solution

${}^{24}X$

Mass number = 24

Number of neutrons = 12

Number of protons = ?

A = Z + n

Z = A − n

Z = 24−12

Z = 12→Magnesium [Mg]

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