Plutonium

Plutonium is dissolved by hydrochloric, hydroiodic, and perchlor acid [3]

2 Pu(s) + 6 H⁺(aq) 2 Pu³⁺(aq) + 3 H₂(g)

Insoluble in nitric acid and concentrated hydrogen sulfide [6].

In air, plutonium is covered by a thin layer of plutonium oxide.

Pu(s) + O₂(g) PuO₂(s)