JAMB - Chemistry (1980 - No. 14)

Chlorine, bromine and iodine resemble each other in that all?

dissolve in alkalis

react violently with hydrogen without heating

displace each other from solutions of their salts

are gases

are liquids

Alkali metals tend to lose one electron and form ions with a single positive charge.

They form ionic compounds (salts) in reaction with the halogens (alkali halides)