Which amongst the following elements have the lowest number of electrons in the valence shell ?

Oxygen

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Chlorine

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Nitrogen

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Boron

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Solution

The correct option is D
Boron

Boron has just 3 electrons in the valence shell. Its atomic number is 5 and electronic configuration is 2, 3.

Oxygen has 6 electrons in the valence shell. Its atomic number is 8 and electronic configuration is 2, 6.

Chlorine has 7 electrons in the valence shell. Its atomic number is 17 and electronic configuration is 2, 8, 7.

Nitrogen has 5 electrons in the valence shell. Its atomic number is 7 and electronic configuration is 2, 5.

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