Name: beryllium
Symbol: Be
Atomic number: 4
Atomic weight: 9.012182 (3)
Group in periodic table: 2
Group name: Alkaline earth metal
Period in periodic table: 2
Block in periodic table: s-block
CAS registry ID: 7440-41-7
Beryllium is a Group 2 (IIA) element. At ordinary temperatures, beryllium resists oxidation in air. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Aquamarine and emerald are precious forms of the mineral beryl, [Be3Al2(SiO3)6].