Identify the element having two electrons in the $K$ shell of its atom.

Hydrogen

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{H e}^{+}

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Helium

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Deuterium

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Solution

The correct option is C Helium
Hydrogen, Deuterium and Helium have $1$ electron in their K-shell. Helium has $2$ electrons in its K shell . Thus the correct answer is option C.Helium.

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Identify the element(s) having two electrons in the $K$ shell of its atom.

2 n^{2}

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