Boor

5
B
Groep
13
Periode
2
Blok
p
Protrone
Elektrone
Neutrone
5
5
6
Algemene Eienskappe
Atoom Nommer
5
Atoommassa
10,811
Massa Nommer
11
Kategorie
Metalloïdes
Kleur
Swart
Radioaktief
Nee
From the Arabic word Buraq, Persian Burah
Kristalstruktuur
Eenvoudige Trigonaal
Geskiendenis
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.
Elektrone per skil
2, 3
Elektronkonfigurasie
[He] 2s2 2p1
B
Boron is an essential nutrient for all green plants
Fisiese Eienskappe
Fase
Soliede
Digtheid
2,34 g/cm3
Smeltpunt
2349,15 K | 2076 °C | 3768,8 °F
Kookpunt
4200,15 K | 3927 °C | 7100,6 °F
Heat of Fusion
50 kJ/mol
Heat of Vaporization
507 kJ/mol
Spesifieke Hitte Kapasiteit
1,026 J/g·K
Oorvloed in die aardkors
0,00086%
Oorvloed in die heelal
1×10-7%
Pure
Beeld Krediete: Images-of-elements
Pure crystalline boron, front side
CAS Nommer
7440-42-8
PubChem CID Nommer
5462311
Atomiese Eienskappe
Atoom radius
90 pm
Kovalente Radius
84 pm
Elektronegatiewiteit
2,04 (Pauling scale)
Ionisasie potensiaal
8,298 eV
Atoom volume
4,6 cm3/mol
Termiese geleidingsvermoë
0,274 W/cm·K
Oksidasiestate
1, 2, 3
Toepassings
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.
Elemental boron, boron oxide, boric acid, borates and many organoboron compounds are non-toxic
Isotope
Stabiele Isotope
10B, 11B
Onstabiele Isotope
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B