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Names Element families sets of chemical elements From Wikipedia, the free encyclopedia Jump to navigation Jump to search There are currently known chemical elements exhibiting a large number of different physical and chemical properties. Amongst this diversity, scientists have found it useful to use names for various sets of elements, that illustrate similar properties, or their trends of properties.
Alkaline earth metals — The metals of group 2: Pnictogens — The elements of group N, P, As, Sb, Bi. Chalcogens — The elements of group O, S, Se, Te, Po. Halogens — The elements of group F, Cl, Br, I, At. Noble gases — The elements of group Lanthanoids — Elements 57— Actinoids — Elements 89— Rare-earth metals — Sc, Y, plus the lanthanoids.
Transition elements — Elements in groups 3 to 11 or 3 to Another common classification is by degree of metallic — metalloidal — nonmetallic behaviour and characteristics. There is no general agreement on the name to use for these sets: Very often these categories are marked by a background color in the periodic table.
Category names used here, without any claim to universality, are: Alkali metals, alkaline earth metals, and noble gases: Transition elements are instead referred to as transition metals.
Lanthanoids and actinoids are instead referred to as lanthanides and actinides respectively. Rare-earth elements, pnictogens, chalcogens, and halogens are not used as category names, but the latter three are valid as group column names.
Additional element category names used: Post-transition metals — The metals of groups 12— The period 7 elements Nh, Fl, Mc, Lv, and Ts are additionally predicted to be post-transition metals. Metalloids — Elements with properties intermediate between metals and non-metals: Reactive nonmetals — Nonmetals that are chemically active as opposed to noble gases: Many other names for sets of elements are in common use, and yet others have been used throughout history.
These sets usually do not aim to cover the whole periodic table as for example period does. Precious metals — Variously-defined group of non-radioactive metals of high economical value.
Coinage metals — Various metals used to mint coins, primarily the group 11 elements Cu, Ag, and Au. Noble metal — Variously-defined group of metals that are generally resistant to corrosion.
Usually includes Ag, Au, and the platinum-group metals.Update on legality of work requirements in Medicaid On June 29, the Federal District Court for the District of Columbia vacated CMS’s approval of Kentucky’s waiver, halting implementation of work requirements in that state.
The judge sent the waiver request back to CMS for review consistent with the court’s opinion. The periodic table of the elements. The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.
Periodic Table of Elements - Elements Database Periodic Table Our periodic table of chemical elements presents complete information on the chemical elements including the chemical element symbol, atomic number, atomic weight and description. Smittybilt Mud/ Snow/ Sand Element Ramp - Pair are the perfect aid for inclement weather conditions or any type of loose terrain.
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There are also other, less specific, groups of elements. These groups are all over the table.
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