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Atomic and Ionic Sizes of Lanthanides

Which of the ...

Question

Which of the following molecule is para-magnetic?

A

Fluorine

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B

Oxygen

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C

Nitrogen

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D

Hydrogen

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Solution

The correct option is B Oxygen
The last two electrons go into separate, degenerate π orbitals, according to Hund's Rule.

Thus, oxygen has two unpaired electrons and is paramagnetic.

Hence, option B is correct.

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