Question: what are 3 physical properties of boron?
Answer: Atomic Symbol: B.
Atomic Number: 5.
Element Category: Metalloid.
Density: 2.08g/cm3.
Melting Point: 3769 F (2076 C)
Boiling Point: 7101 F (3927 C)
Moh's Hardness: ~9.5.