Which of the following does NOT increase while moving down the group of the periodic table?

Correct option is D

The correct answer is (d) Valency.
While moving down a group in the periodic table:
· Metallic Character: Increases because elements tend to lose electrons more easily as the atomic size increases.
· Atomic Radius: Increases due to the addition of new electron shells, which increases the distance between the nucleus and the outermost electrons.
· Number of Shells in an Element: Increases as each successive element down the group has an additional electron shell.
· Valency:Does not increase consistently. The valency of elements in a group typically remains the same because they have the same number of valence electrons, which determines their chemical reactivity and bonding properties.
Information Booster:
· Metallic Character: Refers to the tendency of an element to lose electrons and form positive ions. It increases down a group as the attraction between the nucleus and the outer electrons decreases.
· Atomic Radius: The distance from the nucleus to the outermost shell of an atom. As new shells are added, the atomic radius increases down the group.
· Number of Shells: The number of electron shells increases by one as you move from one element to the next down a group.