Assertion (A): All noble gases are monoatomic | vedclass

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(B) All noble gases have completely filled valence shells,which makes them stable and chemically inert. Therefore,they do not form bonds with other at

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Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$.

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(B) All noble gases have completely filled valence shells,which makes them stable and chemically inert. Therefore,they do not form bonds with other atoms and exist as monoatomic gases.Noble gases have very weak van der Waals forces of attraction between their atoms,which leads to their very low melting and boiling points.While both statements are scientifically correct,the monoatomic nature is due to the stable electronic configuration,not due to their melting or boiling points. Thus,$R$ is not the correct explanation of $A$.

Assertion $(A)$: All noble gases are monoatomic.
Reason $(R)$: All noble gases have very low melting and boiling points.

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Assertion $(A)$: All noble gases are monoatomic.Reason $(R)$: All noble gases have very low melting and boiling points.