These inner transition series are covered under rare-earth element and actinoid element. The actinoid series consists of 15 elements from actinium (symbol Ac, atomic number 89) to lawrencium (symbol Lr, atomic number 103). Lanthanum itself is often regarded as one of the lanthanoids. These elements are called the lanthanoids (or lanthanides) because the chemistry of each closely resembles that of lanthanum. The remaining d -block transition metals and some of their characteristic properties are listed in the Table. Similarly, because zinc, cadmium, and mercury exhibit few of the properties characteristic of the other transition metals, they are treated separately ( see zinc group element ). These three main transition series are included in the set of 30 elements often called the d -block transition metals.īecause scandium, yttrium, and lanthanum actually do not form compounds analogous to those of the other transition metals and because their chemistry is quite homologous to that of the lanthanoids, they are excluded from the present discussion of the main transition metals. The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium (symbol Cd, atomic number 48). Transmission Element 120 Walkthrough Series Includes The
Get exclusive access to content from our 1768 First Edition with your subscription. Third, most of these elements dissolve in mineral acids, although a few, such as platinum, silver, and gold, are called noblethat is, are unaffected by simple (nonoxidizing) acids. Second, the transition metals form many useful alloys, with one another and with other metallic elements. The range in these properties is considerable therefore the statements are comparative with the general properties of all the other elements. They occupy the middle portions of the long periods of the periodic table of elements between the groups on the left-hand side and the groups on the right. 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. Transmission Element 120 Walkthrough By handdechamhe1987 Follow | Public
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