(chemistry) scandium

(physics) A stable isotope, ¹⁰₅B, having five protons and five neutrons, that makes up about 20% of natural boron; it is a good absorber of slow neutrons and is used as a radiation shield in Geiger counters

(physics) A stable isotope, ¹¹₅B, having five protons and six neutrons, that makes up about 80% of natural boron.

(inorganic chemistry) A white solid, of empirical formula B₂O₃, that is an inorganic polymer, and is used in making glass and enamel and for synthesizing other boron compounds.

(inorganic chemistry) An inorganic polymer, of empirical formula BPO₄, used as a phosphor and a source of dietary boron.

(inorganic chemistry) A binary compound of boron and nitrogen, of empirical formula BN; exists in forms analogous to the allotropes of carbon, many of which are inorganic polymers.

(inorganic chemistry) Any compound of general formula RB(OH)₂.

(inorganic chemistry) The compound boron trioxide.

(inorganic chemistry) A binary compound of boron and arsenic, BAs, used as a semiconductor, sometimes alloyed with gallium arsenide.

(inorganic chemistry) A binary compound of boron and fluorine, BF₃; it is a strong Lewis acid.