Transition metal | Definition, Properties, Elements, & Facts
2024年12月6日 · 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. They occupy the middle portions …
Transition metal - Discovery, Properties, Uses | Britannica
2024年12月6日 · Some of the most important and useful transition metals have very low crustal abundances—e.g., tungsten, platinum, gold, and silver. Four of the regular transition metals were known to the ancients: iron (ferrum), copper (cuprum), silver (argentum), and gold (aurum).
Transition metal - Elements, Series, Properties | Britannica
2024年12月6日 · Transition metal - Elements, Series, Properties: Although the transition metals have many general chemical similarities, each one has a detailed chemistry of its own. The closest relationships are usually to be found among the three elements in each vertical group in the periodic table, although within each group the element of the first series ...
Alkali metal | Definition, Properties, & Facts | Britannica
Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids).
Periodic table - Elements, Groups, Blocks | Britannica
2024年11月10日 · A number of the elements of each long period are called the transition metals. These are usually taken to be scandium, 21, to zinc, 30 (the iron-group transition metals); yttrium, 39, to cadmium, 48 (the palladium-group transition metals); and hafnium, 72, to mercury, 80 (the platinum-group transition metals). By this definition, the transition ...
Periodic table | Definition, Elements, Groups, Charges, Trends,
2024年11月10日 · Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in the same column (group) have similar properties.
transition element summary | Britannica
The elements in the periodic table from scandium to zinc (atomic numbers 21–30), yttrium to cadmium (39–48), and lanthanum to mercury (57–80, including the lanthanide series) are frequently designated the three main transition series.
Group | Definition & Facts | Britannica - Encyclopedia Britannica
2024年11月12日 · From left to right in the periodic table, there are two groups (1 and 2) of elements in the s-block, or hydrogen block, of the periodic table; ten groups (3 through 12) in the d-block, or transition block; and six groups (13 through 18) in the p-block, or main block.
Periodic table - Elements, Properties, Periodicity | Britannica
2024年11月10日 · The transition elements in each horizontal series exhibit much less variation in atomic size than do the elements in other parts of the same periods, leading to a similarity in chemical and physical properties.
Metal | Definition, Characteristics, Types, & Facts | Britannica
2024年11月16日 · The high electrical and thermal conductivities of the simple metals (i.e., the non-transition metals of the periodic table) are best explained by reference to the free-electron theory.