Which statement best relates an empirical formula with a molecular formula?

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron

What makes up a film badge? layers of photographic film covered in black paper. an electrolyte paste spread across a plastic sheet. a thin film of salts and other chemicals on clear acetate. a panel of photographic film exposed to the air. ✓

How many stereoisomers will be formed from the addition of phenyllithium to this molecule?