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प्रश्न
Stable form of A may be represented by the formula:
विकल्प
A
A2
A3
A4
उत्तर
A
Explanation:
The electronic configuration of A is 1s2, 2s2, 2p6 having no unpaired electrons in the outermost shells. So, an atom having no unpaired electron in its valence shell is said to be stable.
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