Elements with valency 1 are
(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals

AcademicChemistryNCERTClass 9

Correct Answer: (c) either metals or non-metals

Explanation: Metals and non-metals both can have valency 1. Sodium has a positive valency of +1, it is a metal. Chlorine has a negative valency of -1, it is a non-metal.

[Extra information: The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element.]

Updated on 10-Oct-2022 13:32:10