Boro
5
B
Grupo
13
Perio
2
Bloko
p
Protonoj
Elektronoj
Neŭtronoj
5
5
6
Ĝeneralaj Propraĵoj
Atoma Nombro
5
Atommaso
10,811
Amasa Nombro
11
Kategorio
Metaloidoj
Koloro
Nigra
Radioaktiva
Ne
De la Araba vorto buraq, Persa vorto burah
Kristala Strukturo
Simpla Trigono
Historio
Boron compounds have been known for thousands of years, but the element was not discovered until 1808 by Sir Humphry Davy and by Gay-Lussac and Thenard.
Boron was not recognized as an element until it was isolated in 1808 by Sir Humphry Davy and by Joseph Louis Gay-Lussac and Louis Jacques Thénard.
Jöns Jakob Berzelius identified boron as an element in 1824.
Boron was not recognized as an element until it was isolated in 1808 by Sir Humphry Davy and by Joseph Louis Gay-Lussac and Louis Jacques Thénard.
Jöns Jakob Berzelius identified boron as an element in 1824.
Elektronoj per ŝelo
2, 3
Elektrona Agordo
[He] 2s2 2p1
Boron is an essential nutrient for all green plants
Fizikaj Propraĵoj
Fazo
Solido
Denso
2,34 g/cm3
Fandpunkto
2349,15 K | 2076 °C | 3768,8 °F
Bolpunkto
4200,15 K | 3927 °C | 7100,6 °F
Varmo de Fuzio
50 kJ/mol
Varmo de Vaporiĝo
507 kJ/mol
Specifa Varmo Kapacito
1,026 J/g·K
Krusta Abundo
0,00086%
Universa Abundo
1×10-7%
CAS Nombro
7440-42-8
PubChem Kunmetita Identiga Nombro
5462311
Atomaj Propraĵoj
Atoma Radiuso
90 pm
Kovalenta Radiuso
84 pm
Elektronegativeco
2,04 (Pauling-skalo)
Potencialo de jonigo
8,298 eV
Atoma Volumo
4,6 cm3/mol
Termika Kondukto
0,274 W/cm·K
Oksidaj Ŝtatoj
1, 2, 3
Aplikoj
Boron oxide is used in glassmaking and ceramics.
Borax is used in making fiberglass, as a cleansing fluid, a water softener, insecticide, herbicide and disinfectant.
Boric acid is used as a mild antiseptic and as a flame retardant.
Boron shielding is used as a control for nuclear reactors.
Borax is used in making fiberglass, as a cleansing fluid, a water softener, insecticide, herbicide and disinfectant.
Boric acid is used as a mild antiseptic and as a flame retardant.
Boron shielding is used as a control for nuclear reactors.
Elemental boron, boron oxide, boric acid, borates and many organoboron compounds are non-toxic
Izotopoj
Stabilaj Izotopoj
10B, 11BMalstabilaj Isotopoj
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B