Gold

Gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table. Gold has several qualities that have made it exceptionally valuable throughout history. It is attractive in color and brightness, durable to the point of virtual indestructibility, highly malleable, and usually found in nature in a comparatively pure form. The history of gold is unequaled by that of any other metal because of its perceived value from earliest times.

Gold Properties – What are the Physical Properties of Gold? 

What are the Physical Properties of Gold? The Physical properties of Gold are the characteristics that can be observed without changing the substance into another substance. Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor. The Physical Properties of Gold are as follows:

the Physical Properties of Gold?

Color Bright Yellow
Luster It has a shine or glow
Ductility It can be beaten into extremely thin sheets of gold leaf
Malleability Capable of being shaped or bent
Conductivity Good electrical conductor
Solubility Solubility (ability to be dissolved)
Hardness A relatively soft metal, gold is usually hardened by alloying with copper, silver, or other metals.
Density It is a dense metal
Melting point It melts at 1065°C

Gold Properties – What are the Chemical Properties of Gold? 

What are the Chemical Properties of Gold? They are the characteristics that determine how it will react with other substances or change from one substance to another. The better we know the nature of the substance the better we are able to understand it. Chemical properties are only observable during a chemical reaction. Reactions to substances may be brought about by changes brought about by burning, rusting, heating, exploding, tarnishing etc. The Chemical Properties of Gold are as follows:

What are the Chemical Properties of Gold?

ChemicalFormula Au
Activity Gold is chemically inactive, it’s extremely resistant to chemical action
Compounds Ready reducibility from compounds to metal.
Auric chloride and chloro-auric acid are its most common compounds.
Reactivity withacids Aqua regia, a mixture of nitric and hydrochloric acids, has the ability to dissolve gold
Isotopes It has one stable isotope,197Au
Reactivity with Non-metals Gold does not react with the Non-metals, except for halogens, with which it forms halides
Alloys Silver and platinum

Gold Physical Data

  • Density (g/cc): 19.3
  • Melting Point (°K): 1337.58
  • Boiling Point (°K): 3080
  • Appearance: soft, malleable, yellow metal
  • Atomic Radius (pm): 146
  • Atomic Volume (cc/mol): 10.2
  • Covalent Radius (pm): 134
  • Ionic Radius: 85 (+3e) 137 (+1e)
  • Specific Heat (@20°C J/g mol): 0.129
  • Fusion Heat (kJ/mol): 12.68
  • Evaporation Heat (kJ/mol): ~340
  • Debye Temperature (°K): 170.00
  • Pauling Negativity Number: 2.54
  • First Ionizing Energy (kJ/mol): 889.3
  • Oxidation States: 3, 1. The oxidation states -1, +2 and +5 exist but are rare.
  • Lattice Structure: Face-Centered Cubic (FCC)
  • Lattice Constant (Å): 4.080
  • Specific Gravity (20°C): 18.88
  • CAS Registry Number: 7440-57-5

I am scientist

I am scientist is a result of small effort to make huge impact on children. To stimulate the curiosity of young scientist towards science. Each idea will start with a experiment followed by reasoning the result , scientific learning, vocabulary (recap the big words used), useful reference website and books, along with free downloadable worksheets.

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