Which of the following is truei) Be is not affected by dry airii) Be is amphoteric metaliii) Be has a maximum covalency Four

Beryllium does not react with air, due to its small size and I.EBeryllium is amphoteric metal that means it reacts with both acids as well as bases."Be" does not exhibit coordination number [Covalency] more than "4" since its valency shell [n=2] has only 4 - orbitals So option I,II,III are correct