Electronic configuration of deuterium is _________.

1 s^{2}

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1 s^{1}

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1 s^{2} 2 s^{1}

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1 s^{2} 2 s^{2}

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Solution

The correct option is B $1 s^{1}$
Hydrogen has one proton and no neutron. Its atomic number is one and electronic configuration is $1 s^{1}$ .
Deuterium has one neutron and one proton. The mass number of deuterium is $2$ . Its electronic configuration is same as that of hydrogen, $1 s^{1}$ as it is an isotope of hydrogen.

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