Why do atoms have a tendency to form molecules?

Among the following which statement/s is/are true? (A) Lanthanides have greater tendency to form complexes (B) Actinides have greater tendency to form complexes (C) Lanthanides have lesser tendency to form complexes (D) Actinides have lesser tendency to form complexes

Transition elements have greater tendency to form complexes because they have:

Transition elements have greater tendency to form complexes because

Why do atoms combine to form a molecule ?

Transition elements have greater tendency to form complex because they have:

Why do atoms combine?

Why does sulphur have greater tendency for catenation than oxygen ?

Which of the following element have maximum tendency to form complex compound-