B

Metalloid Atomic Number: 5 Atomic Mass: 10.811 Group: 2 Period: 13

B

Discovered in 1824 by Jön Jakobs Berzerlius

The name Boron Originated from the Arabian word Buruh, or the Pesian word buraq

Compounds

Boron Triflouride (BF3)

Tetrafluoroborate Anion (BF4)

Common Uses

Can be found in bleach Used in making windows that

withstand thermal shock Is found in Silly Putty Is in a compound that is used in the

Lockheed SR-71 Blackbird jet

Appearance

Boron is a brownish black rock lump in Nature, but can be refined to a shiny metal in a lab

Where it’s found

Boron is a natural element that is found as a solid in the earth’s crust

Physical Properties

Melting Point: 2349 K, 2076 °C, 3769 °F

Boiling Point: 4200 K, 3927 °C, 7101 °F

Density: 2.08 g·cm−3

Moh’s Scale: 9.5

Chemical Properties Boron is highly flammable In its amorphous form is react violent

to high temperature by bursting into flames and forming oxides

Though in its crystalline form it is not very reactive even at high temperatures

Boric Acid on fire