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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
In the Earth's crust, aluminium is the most abundant metallic element (8.23% by mass [33]) and the third most abundant of all elements (after oxygen and silicon). [65] A large number of silicates in the Earth's crust contain aluminium. [66] In contrast, the Earth's mantle is only 2.38% aluminium by mass. [67]
Elements in the same group tend to show similar chemical characteristics. Vertical, horizontal and diagonal trends characterize the periodic table. Metallic character increases going down a group and from right to left across a period. Nonmetallic character increases going from the bottom left of the periodic table to the top right.
Post-transition metals (8 C, 9 P) R. ... Transition metals (43 C, 79 P) Pages in category "Metallic elements" The following 4 pages are in this category, out of 4 total.
Mixture of the elements praseodymium and neodymium. Mosander wrongly believed didymium to be an element. [8] Da: Davyum: 43: Discredited claim to discovery of technetium. [nb 2] [5] Db: Dubhium: 69: Eder wrongly believed dubhium to be a new element. Was actually thulium. The symbol Db is now used for dubnium. Db: Dubnium: 104: Proposed name for ...
Titanium is the ninth-most abundant element in Earth's crust (0.63% by mass) [30] and the seventh-most abundant metal. It is present as oxides in most igneous rocks , in sediments derived from them, in living things, and natural bodies of water.
An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive. The metal forms a dark oxide layer when it is exposed to air. Strontium has physical and chemical properties similar to those of its two vertical neighbors in the periodic table, calcium and barium.
Ruthenium is the only 4d transition metal that can assume the group oxidation state +8, and even then it is less stable there than the heavier congener osmium: this is the first group from the left of the table where the second and third-row transition metals display notable differences in chemical behavior.