Aour (Au)

Properties

Abundance
CAS Number	7440-57-5
PubChem CID	23985
Atomic Radius	144
Atomic Volume	10,2
Atomic Weight	196,967
Block	d
Boiling Point	2 856
Bulk Modulus
Category	Transition metals
Crystal Structure	Face Centered Cubic
Color	Gold
Covalent Radius	136
Density	19,282
Electrical Resistivity
Electron Configuration	[Xe] 4f¹⁴ 5d¹⁰ 6s¹
Electrons per shell	2, 8, 18, 32, 18, 1
Electronegativity	2,54
Electrons	79
Group	11
Heat of Fusion	12,5
Heat of Vaporization	330
Ionization Potential	9,226
Magnetic Ordering
Magnetic Susceptibility
Mass	196,967
Mass Number	79
Melting Point	1 064,2
Name	Aour
Neutrons	118
Atomic Number	197
Oxidation States	-1, 1, 2, 3, 5
Period	6
Phase	Solid
Poisson Ratio
Protons	79
Shear Modulus
Specific Heat Capacity	0,129
Symbol	Au
Thermal Conductivity	3,17
Van der Waals radius
Young's Modulus
Abundance in Earth's crust	3.1×10^-7%
Abundance in Universe	6×10^-8%

Au Aour 79 196.966569 11 6 d 79 1064.0 3080.0 [Xe] 4f14 5d10 6s1 2 8 18 32 18 1 19.3 3.1E-7% Gold Cubic: Face centered 2.5 1.92 {"1":"890.1","2":"1980"} 890 222.8 +3,1 1.46 10.2 12.36 324.43 0.128 317.0 0 Solid, Diamagnetic, Conductor, TransitionMetal, Metal, Stable, Natural GOLD Soft, malleable, bright yellow metal. Very malleable. Used in electronics, jewelry and coins. It is a good reflector of infrared radiation, so a thin film of gold is applied to the glass of skyscrapers to reduce internal heating from sunlight. Found in veins in the crust, with cooper ore and native . 3OoLHe-4aNA Gold

Gadolinium was first detected spectroscopically in 1880 by the Swiss chemist Jean Charles Galissard de Marignac who separated its oxide.

He observed spectroscopic lines due to gadolinium in samples of gadolinite and in the separate mineral cerite.

The metal was isolated by Paul Emile Lecoq de Boisbaudran in 1886. From gadolinite, a mineral named for Gadolin, a Finnish chemist 79 From the Anglo-Saxon word "gold" (the origin of the symbol Au is the Latin word "aurum" meaning "gold")

Isotopes of Gadolinium

Standard Atomic Weight

196.966569(5)

Stable Isotopes

¹⁹⁷Au

Unstable Isotopes

¹⁶⁹Au ¹⁷⁰Au ¹⁷¹Au ¹⁷²Au ¹⁷³Au ¹⁷⁴Au ¹⁷⁵Au ¹⁷⁶Au ¹⁷⁷Au ¹⁷⁸Au ¹⁷⁹Au ¹⁸⁰Au ¹⁸¹Au ¹⁸²Au ¹⁸³Au ¹⁸⁴Au ¹⁸⁵Au ¹⁸⁶Au ¹⁸⁷Au ¹⁸⁸Au ¹⁸⁹Au ¹⁹⁰Au ¹⁹¹Au ¹⁹²Au ¹⁹³Au ¹⁹⁴Au ¹⁹⁵Au ¹⁹⁶Au ¹⁹⁸Au ¹⁹⁹Au ²⁰⁰Au ²⁰¹Au ²⁰²Au ²⁰³Au ²⁰⁴Au ²⁰⁵Au

Gadolinium is considered to be moderately toxic

Gadolinium has the highest neutron cross-section among any stable nuclides

Gadolinium is used to make gadolinium yttrium garnets which have microwave applications.

It is also used in intravenous radiocontrast agents in magnetic resonance imaging (MRI).

Gadolinium compounds are used for making green phosphors for color TV tubes, and in manufacturing compact discs.

Aour on ChemicalAid