The electronic configuration of an element `X` is:
` K L M`
`2,8,6`
(i) What is the group number of element `X` in the periodic table?
(ii) What is the period number of element `X` in the periodic table?
(iii) What is the number of valence electrons in an atom is`X`?
(iv) What is the valence of `X`?
(v) Is it a metal or a non metal?

Explanation

(i) From the above given electronic configuration we find that element `X` has 6 valence electrons (in the outermost shell), so the group number of element `X` in the periodic table is `6+10=16`.
(ii) Element `X` has 3 electron shells (`K,L` and `M` ) in this atom, so the period number of `X` is 3. That is `X` belongs to 3rd period of the periodic table.
(iii) Element `X` has 6 valence electrons.
(iv) Element `X` has 6 valence electrons so it needs 2 electrons to complete its octet (8 electrons in valence shell) and become stable. Thus, the valencey of elemetn `X` is 2.
(v) The elements of group 16 are non-metals So `X` is a non metal.