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The ammonium cation has very similar properties to the heavier alkali metal cations and is often considered a close equivalent. [18] [19] [20] Ammonium is expected to behave as a metal ([NH 4] + ions in a sea of electrons) at very high pressures, such as inside giant planets such as Uranus and Neptune. [19] [20]
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.
Nonmetals show more variability in their properties than do metals. [1] Metalloids are included here since they behave predominately as chemically weak nonmetals.. Physically, they nearly all exist as diatomic or monatomic gases, or polyatomic solids having more substantial (open-packed) forms and relatively small atomic radii, unlike metals, which are nearly all solid and close-packed, and ...
An alternative in metallurgy is to consider various malleable alloys such as steel, aluminium alloys and similar as metals, and other materials as nonmetals; [20] fabricating metals is termed metalworking, [21] but there is no corresponding term for nonmetals. A loose definition such as this is often the common usage, but can also be inaccurate.
All four elements tend to form primarily ionic compounds with metals, [136] in contrast to the remaining nonmetals (except for oxygen) which tend to form primarily covalent compounds with metals. [ x ] The highly reactive and strongly electronegative nature of the halogen nonmetals epitomizes nonmetallic character.
Pages in category "Ammonium compounds" The following 136 pages are in this category, out of 136 total. This list may not reflect recent changes. * Ammonium;
A metalloid is an element that possesses a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals, and which is therefore hard to classify as either a metal or a nonmetal. This is a generic definition that draws on metalloid attributes consistently cited in the literature.
The dividing line between metals and nonmetals can be found, in varying configurations, on some representations of the periodic table of the elements (see mini-example, right). Elements to the lower left of the line generally display increasing metallic behaviour; elements to the upper right display increasing nonmetallic behaviour.