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Gold, a chemical element; Genomes OnLine Database; Global-scale Observations of the Limb and Disk, a NASA Explorer Mission of Opportunity; GOLD (parser), an open-source parser-generator of BNF-based grammars; Graduates of the Last Decade, an Institute of Electrical and Electronics Engineers program to garner more university level student members
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
Group 11, by modern IUPAC numbering, [1] is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), gold (Au), and roentgenium (Rg), although no chemical experiments have yet been carried out to confirm that roentgenium behaves like the heavier homologue to gold.
Pyrite is distinguishable from native gold by its hardness, brittleness and crystal form. Pyrite fractures are very uneven, sometimes conchoidal because it does not cleave along a preferential plane. Native gold nuggets, or glitters, do not break but deform in a ductile way. Pyrite is brittle, gold is malleable.
Physical gold has unique risks that other investments don't come with. As Ben Nadelstein, head of content at Monetary Metals, explains, "Gold is a physical asset that can be lost, stolen, or damaged.
Gold is currently considered the heaviest monoisotopic element. Bismuth formerly held that distinction until alpha-decay of the 209 Bi isotope was observed. All isotopes of gold are either radioactive or, in the case of 197 Au, observationally stable, meaning that 197 Au is predicted to be radioactive but no actual decay has been observed. [4]
The chemistry of gold is dominated by its +3 valence state; all such compounds of gold feature covalent bonding, [43] as do its stable +1 compounds. [44] Gold oxide (Au 2 O 3) is amphoteric, with acidic properties predominating; it forms anionic hydroxoaurates M[Au(OH) 4], where M = Na, K, ½Ba, Tl; and aurates such as NaAuO 2. [45]
Gold prices rose throughout 2024, reaching a record high of $2,790 per ounce in October before cooling in November. Despite this slight pullback, financial experts continue to recommend physical ...
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