Among Group 18 elements, is the most abundant element on the Earth’s crust and is the last element of group.

Argon

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Neon

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Helium

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Oganesson

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Solution

The correct options are
A Argon
D Oganesson
Group 18 consists of elements: helium, neon, argon, krypton, xenon, radon and oganesson. All these gases except radon and oganesson occur in the atmosphere.

Element Abundance(% by moles)

Helium 0.00052

Neon 0.0015

Argon 0.93

Krypton 0.00011

Xenon 0.0000087

Radon Trace

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