Boori
5
B
Ryhmä
13
Jakso
2
Lohko
p
Protonia
Elektronit
Neutronia
5
5
6
Yleiset ominaisuudet
Järjestysluku
5
Atomipaino
10,811
Massaluku
11
Luokka
Puolimetallit
Väri
Musta
Radioaktiivisuus
Ei
From the Arabic word Buraq, Persian Burah
Kiderakenne
Yksinkertainen trigoninen
Historia
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.
Elektroneja elektronikuorilla
2, 3
Orbitaalirakenne
[He] 2s2 2p1
Boron is an essential nutrient for all green plants
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
2,34 g/cm3
Sulamispiste
2349,15 K | 2076 °C | 3768,8 °F
Kiehumispiste
4200,15 K | 3927 °C | 7100,6 °F
Sulamislämpö
50 kJ/mol
Höyrystymislämpö
507 kJ/mol
Ominaislämpökapasiteetti
1,026 J/g·K
Esiintyvyys maankuoressa
0,00086%
Esiintyvyys maailmankaikkeudessa
1×10-7%
CAS-numero
7440-42-8
PubChem CID-numero
5462311
Atomiominaisuudet
Atomisäde
90 pm
Kovalenttisäde
84 pm
Elektronegatiivisuus
2,04 (Paulingin asteikko)
Ionisoitumispotentiaali
8,298 eV
Moolitilavuus
4,6 cm3/mol
Lämmönjohtavuus
0,274 W/cm·K
Hapetusluvut
1, 2, 3
Käyttö
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
Isotooppi
Vakaat isotoopit
10B, 11BEpävakaat isotoopit
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B