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Which of the following elements have the same number of protons and neutrons in their atom?

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Hydrogen

Argon

Beryllium

Carbon-12

answer is C.

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Detailed Solution

Carbon – 12 has 6 protons and 6 neutrons of its nucleus.

$_{6}^{12} C \Rightarrow A = 12 and Z = 6$

$∴ n = A - Z \Rightarrow 12 - 6 = 6$

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