Question

an atom has configuration 2,8,2
to which of following element would it be chemically similar and why?
Be (4)
O (8)

Answer 1

It should be Beryllium because it too has 2 electrons in the outermost shell. The element you asked for too lie in s-block, like Be.

Answer 2

It is Be(4) because same no. of valence electrons are there in Beryllium as Given atom.