a ) Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain .
b ) Calculate the number of neutrons present in the nucleus of an element X which is represented as
6X12 .
c ) Write any three applications of isotopes .
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Helium atom with electronic configuration 1s2 has two valence electrons but since it is a noble gas, it does not form a chemical bond, its duplet is complete.Therefore, valency is zero.
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Kiran
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