Boron

5
B
Kumpulan
13
Kala
2
Blok
p
Proton
Elektron
Neutron
5
5
6
Ciri-Ciri Am
Nombor atom
5
Berat atom
10.811
Nombor jisim
11
Kategori
Metaloid
Warna
Hitam
Radioaktif
Tidak
Daripada perkataan Arab Buraq, Parsi Burah
Struktur hablur
Trigonal Ringkas
Sejarah
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.
Bilangan elektron per petala
2, 3
Konfigurasi elektron
[He] 2s2 2p1
B
Boron is an essential nutrient for all green plants
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
2.34 g/cm3
Takat lebur
2349.15 K | 2076 °C | 3768.8 °F
Takat didih
4200.15 K | 3927 °C | 7100.6 °F
Haba pelakuran
50 kJ/mol
Haba pengewapan
507 kJ/mol
Muatan haba molar
1.026 J/g·K
Banyak pada kerak bumi
0.00086%
Banyak pada alam semesta
1×10-7%
Pure
Kredit imej: Images-of-elements
Pure crystalline boron, front side
Nombor CAS
7440-42-8
PubChem CID Number
5462311
Ciri-Ciri Atom
Jejari atom
90 pm
Jejari kovalen
84 pm
Keelektronegatifan
2.04 (Skala Pauling)
Kebolehan mengion
8.298 eV
Isipadu atom
4.6 cm3/mol
Daya pengaliran terma
0.274 W/cm·K
Keadaan pengoksidaan
1, 2, 3
Aplikasi
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
Isotop
Isotop stabil
10B, 11B
Isotop tidak stabil
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B