Metal. Metallic elements characteristically form positive ions when their compounds are in solution.Their oxides form hydroxides rather than acids with water.Nearly three-fourths of the elements in each group of the periodic table are metals except for the Group 17 (halogen) and Group 18 (noble gas) elements. Transition metal, any of various chemical elements that have valence electrons—i.e., electrons that can participate in the formation of chemical bonds—in two shells instead of only one. In chemistry, the periodic table of elements depicts all of the known elements. It mainly includes the transition metals, some metalloids, lanthanides, and actinides.Many different definitions have been proposed—some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity. A heavy metal is a member of a loosely-defined subset of elements that exhibit metallic properties. Definition of metals 1) Elements that form cations when compounds of it are in solution and oxides of the elements form hydroxides rather than acids in water. Metal definition, any of a class of elementary substances, as gold, silver, or copper, all of which are crystalline when solid and many of which are characterized by opacity, ductility, conductivity, and a unique luster when freshly fractured. Metals are defined as those elements which have characteristic chemical and physical properties. Patient discussion about heavy metals. Many metals are strong, shiny, and hard. While the term transition has no particular chemical significance, it is a convenient name by which to distinguish the similarity of the atomic structures and resulting properties of the elements so designated. Up to this day, what elements ought to be included in this group is hugely disputed. Examples are Steel (Iron+Carbon, Bronze (Copper+Tin), and Electrum (Gold+Silver+::Copper). The most active metals are the elements on the left side of the periodic table. Transition metal definition is - any of various metallic elements (such as chromium, iron, and nickel) that have valence electrons in two shells instead of only one —called also transition element. A metal is said to be an active metal when it reacts strongly and quickly with other elements due to the electrons in its structure and its ease of sharing the electrons with other elements. See more. Q. I was told that platinum is used in fragrances for the fullness of the spray. Metal Chemistry - Other Metals. A metal Alloy is a mixture of two or more elements in a solidified solution. Most metals are conductors of electricity, have crystalline solids with a metallic luster and have a high chemical reactivity. In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions, and form metallic bonds between metal atoms and ionic bonds between nonmetal atoms. 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