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Boro

Boro
All data from the card 28
Ngalan, simbolo, kaiphan
boron, B, 5
Kategoriyang elemento
metalloid
Group, period, block
13, 2, p
Gibug-aton sa atomo
10.81(1)
Kontorno sa elektron
[He] 2s2 2p12, 3 Electron shells of boron (2, 3)
Pagkadiskobre
Joseph Louis Gay-Lussac and Louis Jacques Thénard (30 June 1808)
First isolation
Humphry Davy (9 July 1808)
Phase
magahi
Liquid density at m.p.
2.08 g·cm−3
Melting point
2349 K, 2076 °C, 3769 °F
Boiling point
4200 K, 3927 °C, 7101 °F
Heat of fusion
50.2 kJ·mol−1
Heat of vaporization
480 kJ·mol−1
Molar heat capacity
11.087 J·mol−1·K−1
Oxidation states
3, 2, 1(mildly acidic oxide)
Electronegativity
2.04 (Pauling scale)
Ionization energies(more)
1st: 800.6 kJ·mol−1
Atomic radius
90 pm
Covalent radius
84±3 pm
Van der Waals radius
192 pm
Crystal structure
rhombohedral
Magnetic ordering
diamagnetic
Electrical resistivity
(20 °C) ~106 Ω·m
Thermal conductivity
27.4 W·m−1·K−1
Thermal expansion
(25 °C) (β form) 5–7 µm·m−1·K−1
Speed of sound (thin rod)
(20 °C) 16,200 m·s−1
Mohs hardness
~9.5
CAS registry number
7440-42-8

Ang boro (Iningles boron) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga B ug kaiphan nga atomik 5. Ang boro mao ang metalloid.

Galeriya sa hulagway

5 images

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