Pyridine can react with halogens,nitronium fluoroborate, sulfur trioxide, boranes and chromium trioxide to form some useful organic reagents which are introduced briefly in the paper.
Which indubitably indicate that the bismuthous sulfide can only dissolve in halogen acid except hydrofluoric acid, the mixed solution of dilute sulfuric acid and alkali halide.
Much of the interest in perovskites comes because those which combine metal atoms with chlorine, bromine or iodine (members of a group of elements called halogens) are semiconductors.
Silver halides are just some atoms of silver bound to atoms of any element known as a halogen, which includes things like bromine, chlorine, and iodine.
On the other side of the table, you'll find most of the common anion-forming elements grouped together, particularly your halogens, along with oxygen, sulfur, and nitrogen.
In addition to the extreme heat burning, melting and distorying anything it touches, lava releases particles into the air and toxic gases such as sulfur, carbon dioxide and halogen.