Question

An atom has electronic configuration (2,8,5).

i) What is the atomic number of this element?

ii)Write the group number and the period to which this element

belongs in modern periodic table.

iii) To which of the following elements would it be chemically

similar

F(9), N(7), Ar(18)​

Answer 1

Answer:

I) phosphorus

ii) group no. 15 and 3rd period

iii) Ar(18)