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Halogens

Which of the ...

Question

Which of the two would be chemically more reactive element? Element P of atomic number 18 or element Q of atomic number 16? Give reason.

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Solution

Electronic configuration of P is 2,8,8 and of Q is 2,8,6.
P has completely filled valence shell as it has 8 electrons in its outermost M shell. Q has 2 electrons less than a full octet. Elements with incompletely filled valence shell are reactive while ones with full octet are inert.

So, Q is more reactive than P

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