'संयोजकता' (valency) का अर्थ है:

उत्तर: (A) किसी तत्व की संयोजन क्षमता (संयोजकता) — Valency = number of electrons an atom can gain, lose, or share to complete its outermost shell. Na = 1 (loses 1e⁻), Cl = 1 (gains 1e⁻), O = 2, N = 3, C = 4. Octet rule: atoms want 8 electrons in outer...