Question

An atom has electronic configuration 2, 8, 2.
(a) What is the atomic number of this element?
(b) What is its valency?
(c) To which of the following elements would it be chemically similar and why? Be (4), O(8),
justify your answer. (Atomic number are given in brackets)

Answer 1

a. The atomic number is 12
b. The valency of it is +2. It can donate electrons.
c. Be because they both have same number of valence electron in their outermost orbit. Hence both are metals can donate electrons. And both lie in same group that is group 2 so they have same physical and chemical properties.

Answer 2

Refer to the attachment for answer.
Hope my answer helps you
Mark it as BRAINLIEST