Answer
Elements -- (c) Cs; (e) O; (j) S
Elements and molecules -- (b) $S_{8}$; (f) $O_{2}$; (g) $O_{3}$; (k) $P_{4}$
Molecules, but not compounds -- None
Compounds, but not molecules -- (i) KBr; (l) LiF
Both compounds and molecules -- (a) $SO_{2}$ ; (d) $N_{2}O_{5}$; (h) $CH_{4}$
Work Step by Step
For us to categorize the given, we must know these definitions:
Element - a substance that CANNOT be separated into simpler substances by chemical means (may
Compound - a substance composed of atoms of at least TWO elements chemically united in fixed proportions
Molecule - an aggregate of at least two atoms (not necessarily different elements) in a definite arrangement held together by chemical bonds.
