Bulawan

Gold
79Au
Ag ↑ Au ↓ Rg Periodic table platinum ← gold → mercury
Appearance
metallic yellow
General properties
Name, simbolo, kaiphan	gold, Au, 79
Pronunciation	Plantilya:IPAc-en
Element category	puthaw nga transisyon
Group, period, block	11, 6, d
Standard atomic weight	196.966569(4)
Electron configuration	[Xe] 4f14 5d10 6s1 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
Magnetic ordering	diamagnetic
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

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.

Galeriya sa hulagway

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