金子

Description

Gold · CAS 7440-57-5 · Au. UNII 79Y1949PYO. Boiling Point: 2700 deg C; Boiling Point: 2856 °C @760 [mm Hg]; Melting Point: 1064.76 deg C.

Identification

CAS Registry Number	7440-57-5
PubChem CID	23985
Molecular formula	Au
IUPAC name	gold
UNII (FDA)	79Y1949PYO

Computed Descriptors

Molecular Weight	196.96657
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	0
Exact Mass	196.966570
Monoisotopic Mass	196.966570
Topological Polar Surface Area	0
Heavy Atom Count	1
Formal Charge	0
Complexity	0

Physical & Chemical Properties

Boiling Point	2700 deg C
Boiling Point	2856 °C @760 [mm Hg]
Melting Point	1064.76 deg C
Melting Point	1064.76 °C
Density	19.3
Density	19.3 @25 °C
Vapor Pressure	1 [mm Hg] @1869 °C
Heat of Vaporization	324 kJ/mol

Physical description & handling notes

• CBI; Other Solid; Dry Powder
• Gold-coloured powder or tiny sheets
• Yellow, ductile metal, relatively soft; [HSDB]
• Soft, yellow metal
• Cubic, yellow, ductile, metallic crystals; forms red, blue, or violet colloidal suspensions.
• Yellow, ductile metal, relatively soft

Regulatory Status

Regulatory & Food Contact	COLOUR: Food Additives GOLD (metallic) NO ADI ALLOCATED Not re-evaluated by JECFA, but the provisions for gold was withdrawn at CCFA50 TRS 617-JECFA 21/19 CIR / INCI: Cosmetic colorant
GHS notification summary	99.2% (502 / 506)

GHS Hazard Classification

GHS notification summary	99.2% (502 / 506)

Documented Uses

• Electroplating [Category: Plate]
• Semiconductor Manufacturing [Category: Industry]
• Smelting Copper or Lead [Category: Industry]
• Photographic Processing [Category: Other]
• Glass Manufacturing [Category: Industry]
• Metal Extraction and Refining [Category: Industry]

Synonyms

GOLD; 7440-57-5; Gold powder; Colloidal gold; Gold flake; Gold leaf; Gold, colloidal; Gold, elemental; Shell Gold; Burnish gold; Magnesium gold purple; Aurum Metallicum; CI 77480; 79Y1949PYO; C.I. 77480; Gold (e 175)

Frequently Asked Questions

What are the CAS number and molecular formula of Gold?

CAS 7440-57-5; molecular formula Au; molecular weight — g/mol.

What other names is Gold known by?

GOLD, 7440-57-5, Gold powder, Colloidal gold, Gold flake, Gold leaf.

What is the regulatory status of Gold?

Documented regulatory listings: COLOUR: Food Additives; GOLD (metallic); NO ADI ALLOCATED.

Is Gold classified as hazardous?

99.2% of GHS notifications report no hazard classification (502 of 506).

What are the key physical properties of Gold?

Boiling Point: 2700 deg C; Boiling Point: 2856 °C @760 [mm Hg]; Melting Point: 1064.76 deg C; Melting Point: 1064.76 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.