Question

Right or wrong sentence.

P-segment is composed of groups 1 and 2.

Answer 1

The given sentence is wrong.

Explanation:

The “P‑segment” (the p‑block) contains the elements whose valence electrons occupy p orbitals, that is, groups 13–18 in the modern (1–18) numbering (sometimes written 3A–8A in older notation). Groups 1 and 2 are the alkali and alkaline‑earth metals (the s‑block, with 1 and 2 valence electrons), so they are not part of the p‑segment.