Boron (B)

Atomic Number5
Atomic Mass10.81 u
CategoryMetalloid
Electron Config[He] 2s² 2p¹
Appearanceblack-brown
Density (STP)2460 g/L
Melting Point2349 K
Boiling Point4200 K
Electronegativity2.04 (Pauling)
Ionization Energy800.6 kJ/mol
Atomic Radius85 pm
Crystal StructureSimple Trigonal
Discovered ByJoseph Louis Gay-Lussac (1808)

Brief Introduction

Boron (B) is a metalloid element that appears as a dark, amorphous powder or as extremely hard, black crystalline material. It is essential in many industrial applications and biological processes. Key details about Boron (B) are as follows:

Uses: Used in borosilicate glass (Pyrex), fiberglass insulation, detergents and bleaches (borax, perborate), fertilizers, and high-strength composites for aerospace. Boron neutron capture therapy (BNCT) is used in cancer treatment.

Production/Extraction: Extracted from borax and kernite minerals, primarily from deposits in Turkey, the United States (California), and Argentina. Produced through reduction of boron oxide or electrolysis of molten salts.

History: Discovered independently by Joseph Louis Gay-Lussac and Louis-Jacques Thénard in France, and Humphry Davy in England, all in 1808. Named from the Arabic "buraq" and Persian "burah" (borax).

Health Effects & Safety: Essential micronutrient for plants and possibly for humans in trace amounts. Boric acid has low toxicity but high doses can be harmful. Boron compounds are used as mild antiseptics.

Price/Market: Relatively abundant and affordable. Turkey controls about 70% of global reserves, making it geopolitically significant for the boron market.

Properties: Exists in multiple allotropic forms, extremely hard (second only to diamond and cubic boron nitride), high melting point (2076°C), semiconductor properties, and forms strong covalent bonds.

← Beryllium (Be) · Carbon (C) →

Periodic Table