$O_{2}$ made up of two atoms is

Monoatomic

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Diatomic

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Triatomic

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Tetraatomic

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Solution

The correct option is B Diatomic
Oxygen has atomic no. 8 and its electronic configuration is (2,6) it needs two more electron to complete its outermost shell and form an octet. Hence its reactive in monoatomic state. It gains 2 electrons from another oxygen atom by sharing 2 pairs of electrons thus becoming stable. Hence oxygen molecule with two oxygen atoms is diatomic.

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