A helium atom has 2 electrons in its valence shell, but it does not have a valency of 2. Justify the statement.
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Solution

The atomic number of helium is 2. So its electronic configuration is 2. It obeys the duplet rule and is a noble gas since, its valence shell contains 2 electrons.
Therefore, helium does not prefer to lose/share/gain electrons.
Hence, its valency is 0.
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Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

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