| http://www.w3.org/ns/prov#value | - number of electrons, all isotopes of an element have the same checmical properties.Compound: A chemical compound is a substance formed by the combination of two or more elements in definite proportions.The main types of bonds are ionic bonds and covalent bonds:Ionic bonds: An ionic bond is formed when 1 or more electrons are transferred from one atom to another.Ions: positively or negatively char
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