Bulawan

Gikan sa Wikipedia, ang gawasnong ensiklopedya
Gold
79Au
Ag

Au

Rg
platinumgoldmercury
Appearance
metallic yellow
General properties
Name, simbolo, kaiphan gold, Au, 79
Pronunciation Plantilya:IPAc-en
Element category puthaw nga transisyon
Group, period, block 116, d
Standard atomic weight 196.966569(4)
Electron configuration [Xe] 4f14 5d10 6s1
2, 8, 18, 32, 18, 1
Electron shells of gold (2, 8, 18, 32, 18, 1)
History
Discovery Middle Easterns (before 6000 BC)
Physical properties
Phase magahi
Density (near r.t.) 19.30 g·cm−3
Liquid density at m.p. 17.31 g·cm−3
Melting point 1337.33 K, 1064.18 °C, 1947.52 °F
Boiling point 3129 K, 2856 °C, 5173 °F
Heat of fusion 12.55 kJ·mol−1
Heat of vaporization 324 kJ·mol−1
Molar heat capacity 25.418 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1646 1814 2021 2281 2620 3078
Atomic properties
Oxidation states 5, 4, 3, 2, 1, −1, −2
(amphoteric oxide)
Electronegativity 2.54 (Pauling scale)
Ionization energies 1st: 890.1 kJ·mol−1
2nd: 1980 kJ·mol−1
Atomic radius 144 pm
Covalent radius 136±6 pm
Van der Waals radius 166 pm
Miscellanea
Crystal structure lattice face centered cubic
Gold has a lattice face centered cubic crystal structure
Magnetic ordering diamagnetic[1]
Electrical resistivity (20 °C) 22.14 nΩ·m
Thermal conductivity 318 W·m−1·K−1
Thermal expansion (25 °C) 14.2 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) 2030 m·s−1
Tensile strength 120 MPa
Young's modulus 79 GPa
Shear modulus 27 GPa
Bulk modulus 180 GPa
Poisson ratio 0.44
Mohs hardness 2.5
Vickers hardness 216 MPa
Brinell hardness 25 HB MPa
CAS registry number 7440-57-5
Most stable isotopes
Main article: Isotopes of gold
iso NA half-life DM DE (MeV) DP
195Au syn 186.10 d ε 0.227 195Pt
196Au syn 6.183 d ε 1.506 196Pt
β 0.686 196Hg
197Au 100% 197Au is stable with 118 neutrons
198Au syn 2.69517 d β 1.372 198Hg
199Au syn 3.169 d β 0.453 199Hg
t  h  u
· r

Ang bulawan o oro (Iningles gold) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Au ug kaiphan nga atomik 79. Ang bulawan mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

  1. Magnetic susceptibility of the elements and inorganic compounds in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 


Galeriya sa hulagway[usba | edit source]