Match List I with List II and select the answer using the code given below the Lists : List I (Element) A. Phosphorus B. Nitrogen C. Neon D. Sulphur List II (Atomicity) 1. 2 2. 1 3. 8 4. 4 Code : ABCD (a) 4 1 2 3 (b) 4 2 1 3 (c) 3 2 1 4 (d) 3 1 2 4

Atomicity refers to the number of atoms constituting a single molecule of an element. Phosphorus (A) typically exists as a tetra-atomic molecule, P4, giving it an atomicity of 4 [1]. Nitrogen (B) exists as a diatomic gas, N2, where two atoms are linked by a triple bond, resulting in an atomicity of 2. Neon (C) is a noble gas; these elements have complete octets and exist as single atoms, meaning their atomicity is 1. Sulphur (D) commonly forms polyatomic molecules consisting of eight atoms joined in a ring structure (S8), thus its atomicity is 8. Matching these values: A-4, B-1, C-2, D-3 corresponds to the sequence 4, 2, 1, 3 in the list indices, but based on the provided code options, the correct mapping is A-4, B-1, C-2, D-3 which aligns with option (a).

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 60