An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.) (a) N(7) (b) F(9) (c) P(15) (d) Ar(18)

Answer: 

(a)

The number of electrons present in an atom is

⇒ 2+8+7 = 17.

Therefore, the atomic number of this element is 17 and the element is chlorine.

Cl (Z = 17) = 1s2 2s2 2p6 3s2 3p5

(b) 

Answer: (b) F(9)

It would be chemically similar to F(9) with configuration as 2, 7.

Electronic configuration of Fluorine is,

F (Z = 9) = 1s2 2s2 2p5

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