Bor

5
B
Grupp
13
Period
2
Block
p
Protoner
Electrons
Neutroner
5
5
6
Generella Egenskaper
Atomnummer
5
Atommassa
10,811
Mass Number
11
Kategori
Metalloid
Färg
Svart
Radioaktiv
Nej
From the Arabic word Buraq, Persian Burah
Kristallstruktur
Enkelt trigonal
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.
Elektroner per skal
2, 3
Elektronkonfiguration
[He] 2s2 2p1
B
Boron is an essential nutrient for all green plants
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
2,34 g/cm3
Smältpunkt
2349,15 K | 2076 °C | 3768,8 °F
Kokpunkt
4200,15 K | 3927 °C | 7100,6 °F
Smältvärme
50 kJ/mol
Ångbildningsvärme
507 kJ/mol
Specifik värmekapacitet
1,026 J/g·K
Abundance in Earth's crust
0,00086%
Abundance in Universe
1×10-7%
Pure
Bildkrediter: Images-of-elements
Pure crystalline boron, front side
CAS Number
7440-42-8
PubChem CID Number
5462311
Atomära Egenskaper
Atomradie
90 pm
Kovalent radie
84 pm
Elektronegativitet
2,04 (Paulingskalan)
Jonisationspotential
8,298 eV
Molvolym
4,6 cm3/mol
Värmeledningsförmåga
0,274 W/cm·K
Oxidationstillstånd
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.
Elemental boron, boron oxide, boric acid, borates and many organoboron compounds are non-toxic
Isotoper
Stabila isotoper
10B, 11B
Instabila isotoper
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B