Question

The electronic configuration of an element is 2, 8, 7:
(a) ) What is the atomic number of this element ?
(b) To which of the following elements is this element chemically similar
N(7), F(9), P(15), Ar(18)
( 2 marks ) pls answer ​

Answer 1

Answer:

Solution: 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.

Explanation:

please

Answer 2

Answer:

a) 17(seventeen)

b) F(9)