Gallium Pípè / ˈ ɡ æ l i ə m / (GAL -ee-əm ) Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Ga) 69.723(1) [ 1] Gallium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 31 Ẹgbẹ́ group 13 (boron group) Àyè àyè 4 Àdìpọ̀ Àdìpọ̀-p Ẹ̀ka ẹ́límẹ́ntì Post-transition metal Ìtò ẹ̀lẹ́ktrọ́nù [Ar ] 3d10 4s2 4p1 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 3 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 302.9146 K (29.7646 °C, 85.5763 °F) Ígbà ìhó 2477 K (2204 °C, 3999 °F) Kíki (near r.t. ) 5.91 g/cm3 when liquid (at m.p. ) 6.095 g/cm3 Heat of fusion 5.59 kJ/mol Heat of 254 kJ/mol Molar heat capacity 25.86 J/(mol·K) 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 −5, −4, −3,[ 2] −2, −1, +1, +2, +3 [ 3] Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.81 energies Atomic radius empirical: 135 pm Covalent radius 122±3 pm Van der Waals radius 187 pm Color lines in a spectral range Spectral lines of galliumOther properties Natural occurrence primordial Crystal structure orthorhombic Speed of sound thin rod 2740 m/s (at 20 °C) Thermal expansion 1.2 µm/(m·K) (at 25 °C) Thermal conductivity 40.6 W/(m·K) Electrical resistivity 270 Ω·m (at 20 °C) Magnetic ordering diamagnetic Young's modulus 9.8 GPa Poisson ratio 0.47 Mohs hardness 1.5 Brinell hardness 60 MPa CAS Number 7440-55-3 Main isotopes of gallium
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