Question

5. 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.) N(7), F(9), P(15), Ar(18)​

Answer 1

As the electronic configuration of the given atom is 2,8,7 it is inferred that the atomic number of element is 17 (2+8+7). Thus element with atomic number 17 is Chlorine. Among the options given which includes Nitrogen, Fluorine, Phosphorus and Argon, chlorine is chemically similar to fluorine....

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Answer 2

Answer:

a. Element with electronic configuration 2, 8, 7 = 17 is atomic number and it is Chlorine.

b. Among the options given which includes Nitrogen, Fluorine, Phosphorus and Argon, chlorine is chemically similar to fluorine.