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nickel(III)oxide [Supplementary Concept]
Date introduced: September 8, 1988
Transition Elements
Elements with partially filled d orbitals. They constitute groups 3-12 of the periodic table of elements.
Year introduced: 2002
Metals, Heavy
Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant and Hackh's Chemical Dictionary, 5th ed)
Year introduced: 1997
Nickel
A trace element with the atomic symbol Ni, atomic number 28, and atomic weight 58.69. It is a cofactor of the enzyme UREASE.
Metals
Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant and Hackh's Chemical Dictionary, 5th ed)
Inorganic Chemicals
A broad class of substances encompassing all those that do not include carbon and its derivatives as their principal elements. However, carbides, carbonates, cyanides, cyanates, and carbon disulfide are included in this class.
Year introduced: 1998
Elements
Substances that comprise all matter. Each element is made up of atoms that are identical in number of electrons and protons and in nuclear charge but may differ in mass or number of neutrons.