Question

An atom has electronic configuration 2,8,7.to which of the following elements would it be chemically, similar?(atomic number are given in the parentheses)

Answer 1

Answer:

Atom is Chlorine (1s²2s²2p63s²4p5)

it is a halogen

and chemically similar to fluronine, bromine and iodine

Answer 2

$\huge\mathrm\green{Answer→}$

(a)The element with electronic configuration (2+8+7) 17 is chlorine.

The no. of atomic number = no. of electrons

Therefore, atomic number is 17.

(b) An atom with electronic configuration 2, 8, 7 would be chemically similar to F (9)