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Question

Assertion :Most elements and all compounds exist as molecules. Reason: If valence shell is not fully filled, they make it completely filled by transfer of electrons (either gaining or losing ) or by sharing of electrons with other atoms of same type or different types. This combination of atoms results in molecule.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Every elements in nature need stability. This stability is achieved when valence shell of an atom is fully filled i.e. they have got noble gas electronic configuration. If valence shell is not fully filled, they make it completely filled by transfer of electrons (either gaining or losing ) or by sharing of electrons with other atoms of same type or different types.This combination of atoms results in molecule. Hence, molecule is formed for the stability.

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