The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?

Q. The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?

A. N(7)

B. P(15)

C. Na(11)

D. F (9)

Answer: F (9)