An element A has an atomic number $7$ and mass number $14.$
$B$ has electronic configuration $2, 8, 8.$
$C$ has $13$ electrons, $14$ neutrons.
$D$ has $18$ protons and $22$ neutrons.
$E$ has electronic configuration $2, 8, 8, 1.$
State which is an inert gas.

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Solution

A is Nitrogen. Valency 3 or 5. Its non metal.
B is Argon. Valency 0
C is Aluminium. Valency is 3. Its metal.
D is Argon (noble gas/inert gas). Valency 0.
E is Kalium (Potassium). Valency 1. Its metal.
B and D is inert gas.

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