Question

Highly electropositive Alkali metals are separated from highly electronegative halogens by _________

(a) noble gases

(b) oxygen family

(c) f-block elements

(d) 7^th period

This question was posed to me during an internship interview.

My doubt is from Kossel-Lewis Approach to Chemical Bonding in portion Chemical Bonding and Molecular Structure of Chemistry – Class 11

Answer 1

The correct answer is (a) noble gases

To elaborate: According to Kossel, Highly electropositive Alkali metals are separated from highly electronegative halogens by noble gases. This is because Alkali metals are the 1^st group and halogens the 17^th group. Elements in 18^th group i.e. nobles are preceded by group 17 elements and succeeded by group 1 elements.