Bor
5
B
Skupina
13
Perioda
2
Blok
p
Protoni
Elektroni
Nevtroni
5
5
6
Splošne lastnosti
Vrstno število
5
Atomska teža
10,811
Masno število
11
Kategorija
Polkovine
Barva
Črna
Radioaktivno
Ne
From the Arabic word Buraq, Persian Burah
Kristalna struktura
Enostavna trigonalna
Zgodovina
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.
Elektroni po lupinah
2, 3
Razporeditev elektronov
[He] 2s2 2p1
Boron is an essential nutrient for all green plants
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
2,34 g/cm3
Tališče
2349,15 K | 2076 °C | 3768,8 °F
Vrelišče
4200,15 K | 3927 °C | 7100,6 °F
Talilna toplota
50 kJ/mol
Izparilna toplota
507 kJ/mol
Toplotna kapaciteta
1,026 J/g·K
Zastopanost v Zemljini skorji
0,00086%
Zastopanost v vesolju
1×10-7%
CAS številka
7440-42-8
PubChem CID številka
5462311
Atomske lastnosti
Atomski polmer
90 pm
Kovalentni polmer
84 pm
Elektronegativnost
2,04 (Paulingova lestvica)
Ionizacijski potencial
8,298 eV
Atomski volumen
4,6 cm3/mol
Toplotna prevodnost
0,274 W/cm·K
Oksidacijska stanja
1, 2, 3
Uporabe
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
Izotopi
Stabilni izotopi
10B, 11BNestabilni izotopi
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B