Name: boron
Symbol: B
Atomic number: 5
Atomic weight: 10.811 (7) g m r
Group in periodic table: 13
Group name:
Period in periodic table: 2
Block in periodic table: p-block
CAS registry ID: 7440-42-8
Boron is a Group 13 element. Boron has properties which are borderline between metals and non-metals. It is a semiconductor rather than a metallic conductor. Chemically it is closer to silicon than to aluminium, gallium, indium, and thallium.
Crystalline boron is inert chemically and is resistant to attack by boiling HF or HCl. When finely divided it is attacked slowly by hot concentrated nitric acid.