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)



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


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

Watch the video for more information

Refer more

Was this answer helpful?


3 (22)


Choose An Option That Best Describes Your Problem

Thank you. Your Feedback will Help us Serve you better.

Leave a Comment

Your Mobile number and Email id will not be published.





App Now