Which of the two elements given below would be chemically more reactive :

Q. Which of the two elements given below would be chemically more reactive :
‘X’ of atomic number 18 or element Z of atomic number 16? and why ? 
Ans. Element Z, having atomic number 16 is chemically more reactive than element X of atomic number 18. It is because the outermost shell of the atom of element Z has six electrons only and has to complete its octet whereas the outermost shell of the atom of element X is completely filled up, i.e., its octet is complete and thus it shows little chemical activity.

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