Elements that lie between transition metals and metalloids on the periodic table; soft, poor mechanical strength, lower melting point than transition metals; chemically classified by covalent bonding patterns, amphoterism, and anionic species formation.
GHS H Statement H250-H261-H228-H334-H317 Catches fire spontaneously if exposed to air. In contact with water releases flammable gas. Flammable solid. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause an allergic skin reaction.