Бор
5
B
Група
13
Периода
2
Блок
p
Протони
Електрони
Неутрони
5
5
6
Општа својства
Атомски број
5
Атомска маса
10,811
Масени број
11
Категорија
Металоиди
Боја
Црно
Радиоактиван
Не
From the Arabic word Buraq, Persian Burah
Кристална структура
Једноставни троугаони
Историја
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.
Електрони по љусци
2, 3
Електронска конфигурација
[He] 2s2 2p1
Boron is an essential nutrient for all green plants
Физичка својства
Стање
Чвсрто
Густина
2,34 g/cm3
Температура топљења
2349,15 K | 2076 °C | 3768,8 °F
Температура кључања
4200,15 K | 3927 °C | 7100,6 °F
Топлота топљења
50 kJ/mol
Топлота испаравања
507 kJ/mol
Специфична топлота
1,026 J/g·K
Заступљеност у Земљиној кори
0,00086%
Заступљеност у Космосу
1×10-7%
CAS број
7440-42-8
ПубЦхем ЦИД број
5462311
Атомска својства
Атомски радијус
90 pm
Ковалентни радијус
84 pm
Електронегативност
2,04 (Полингова скала)
Јонизујући потенцијал
8,298 eV
Молска запремина
4,6 cm3/mol
Топлотна проводљивост
0,274 W/cm·K
Оксидациона стања
1, 2, 3
Примена
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
Изотопи
Стабилни изотопи
10B, 11BНестабилни изотопи
7B, 8B, 9B, 12B, 13B, 14B, 15B, 16B, 17B, 18B, 19B