Bor
5
B
Gruppe
13
Periode
2
Blokk
p
Protons
Electrons
Neutrons
5
5
6
Generelle eigenskapar
Atomnummer
5
Atommasse
10,811
Mass Number
11
Kategori
Halvmetall
Farge
Svart
Radioactive
Nei
From the Arabic word Buraq, Persian Burah
Krystallstruktur
Simple Trigonal
Historie
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.
Elektron per energinivå
2, 3
Elektronkonfigurasjon
[He] 2s2 2p1
Boron is an essential nutrient for all green plants
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
2,34 g/cm3
Smeltepunkt
2349,15 K | 2076 °C | 3768,8 °F
Kokepunkt
4200,15 K | 3927 °C | 7100,6 °F
Smeltevarme
50 kJ/mol
Fordampingsvarme
507 kJ/mol
Spesifikk varmekapasitet
1,026 J/g·K
Abundance in Earth's crust
0,00086%
Abundance in Universe
1×10-7%
CAS Number
7440-42-8
PubChem CID Number
5462311
Atom eigenskapar
Atomradius
90 pm
Kovalent radius
84 pm
Elektronegativitet
2,04 (Paulings skala)
Ioniseringspotensial
8,298 eV
Molart volum
4,6 cm3/mol
Termisk konduktivitet
0,274 W/cm·K
Oksidasjonstrinn
1, 2, 3
Applications
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
Isotopes
Stable Isotopes
10B, 11BUnstable Isotopes
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B