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Metals-
Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.
Non- Metal-
In chemistry, a nonmetal is a chemical element that usually gains one or more electrons when reacting with a metal and forms an acid when combined with oxygen and hydrogen.
Atoms-
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Molecules
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.
Metalloid
A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals.
Compound
A substance that contains atoms of two or more chemical elements held together by chemical bonds, any combination of two or more parts
Elements
Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes.
Radioactive elements
Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability.
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