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When we move left to right in a period ,the atomic radius of elements does decrease

but at the last ,the noble gases have a greater radius than any other element in period.Why does it happens?

Posted by Anuj Mishra 8 years, 10 months ago

CBSE > Class 10 > Science

2 answers

Naveen Sharma 8 years, 10 months ago

Ans. Noble gases are inert or inactive in nature due to their stable octet configurations. Since, the noble gases do not form bonds with other molecules, so their internal bonding between the atoms and molecules are just considerd as vander wall's bonding which is weaker than covalent bonding and larger in size and found in identical atoms or molecules.

Noble gases have comparatively large atomic sizes as they have vanderwaals radii which is larger than both the ionic and covalent radii.

1Thank You

Arinan Aggarwal 8 years, 10 months ago

Because it can't form bond with any other elements.

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CBSE > Class 10 > Science