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Number of Elements in a Period

Which amongst...

Question

Which amongst the following element is present at the top of periodic table?

A

Nitrogen

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B

Lithium

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C

Oxygen

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D

Hydrogen

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Solution

The correct option is D Hydrogen
Hydrogen is a non-metal and is placed above in the periodic table because it has ${n s}^{1}$ electronic configuration like the alkali metals. It also forms dihydrogen like halogens and forms hydride anion.

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