Bor

5
B
Skupina
13
Perioda
2
Blok
p
Protons
Electrons
Neutrons
5
5
6
General Properties
Vrstno število
5
Atomska teža
10,811
Mass Number
11
Kategorija
Polkovine
Barva
Črna
Radioactive
Ne
From the Arabic word Buraq, Persian Burah
Kristalna struktura
Simple Trigonal
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.
Electrons per shell
2, 3
Razporeditev elektronov
[He] 2s2 2p1
B
Boron is an essential nutrient for all green plants
Physical Properties
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
Abundance in Earth's crust
0,00086%
Abundance in Universe
1×10-7%
Pure
Zasluge za slike: Images-of-elements
Pure crystalline boron, front side
CAS Number
7440-42-8
PubChem CID Number
5462311
Atomic Properties
Atomski polmer
90 pm
Kovalentni polmer
84 pm
Elektronegativnost
2,04 (Paulingova lestvica)
Ionization Potential
8,298 eV
Atomic Volume
4,6 cm3/mol
Toplotna prevodnost
0,274 W/cm·K
Oksidacijska stanja
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
Isotopes
Stable Isotopes
10B, 11B
Unstable Isotopes
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B