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X^3– is isoelectronic with Ar. It has electrons and neutrons in equal number. The mass number of X is

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answer is D.

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Detailed Solution

$X^{3 -} = [Ar] which contain 18 electrons$

so, element ‘X’ has 15 protons

$∴$ Mass number = p + n = 15 + 18 = 33

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