Galio

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Gallium
31Ga
Al

Ga

In
zincgalliumgermanium
Appearance
silver-white
General properties
Name, simbolo, kaiphan gallium, Ga, 31
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category post-transition metal
Group, period, block 134, p
Standard atomic weight 69.723(1)
Electron configuration [Ar] 4s2 3d10 4p1
2, 8, 18, 3
Electron shells of gallium (2, 8, 18, 3)
History
Prediction Dmitri Mendeleev (1871)
Discovery Lecoq de Boisbaudran (1875)
First isolation Lecoq de Boisbaudran (1875)
Physical properties
Phase magahi
Density (near r.t.) 5.91 g·cm−3
Liquid density at m.p. 6.095 g·cm−3
Melting point 302.9146 K, 29.7646 °C, 85.5763 °F
Boiling point 2477 K, 2204 °C, 3999 °F
Heat of fusion 5.59 kJ·mol−1
Heat of vaporization 254 kJ·mol−1
Molar heat capacity 25.86 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1310 1448 1620 1838 2125 2518
Atomic properties
Oxidation states 3, 2, 1
(amphoteric oxide)
Electronegativity 1.81 (Pauling scale)
Ionization energies
(more)
1st: 578.8 kJ·mol−1
2nd: 1979.3 kJ·mol−1
3rd: 2963 kJ·mol−1
Atomic radius 135 pm
Covalent radius 122±3 pm
Van der Waals radius 187 pm
Miscellanea
Crystal structure orthorhombic
Gallium has a orthorhombic crystal structure
Magnetic ordering diamagnetic
Electrical resistivity (20 °C) 270 nΩ·m
Thermal conductivity 40.6 W·m−1·K−1
Thermal expansion (25 °C) 18 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 2740 m·s−1
Young's modulus 9.8 GPa
Poisson ratio 0.47
Mohs hardness 1.5
Brinell hardness 60 MPa
CAS registry number 7440-55-3
Most stable isotopes
Main article: Isotopes of gallium
iso NA half-life DM DE (MeV) DP
69Ga 60.11% 69Ga is stable with 38 neutrons
71Ga 39.89% 71Ga is stable with 40 neutrons
t  h  u
· r

Ang galio (Iningles gallium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ga ug kaiphan nga atomik 31. Ang galio mao ang puthaw.

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