Definitions c1 0.0 / 5 ? ChemistryDefinationsGCSECCEA Created by: EmercullenCreated on: 26-02-19 17:29 Isotopes Elements made up of the same type of atoms 1 of 13 Compund A compound is formed when 2 or more different elements are chemically joined together 2 of 13 Ions An ion is a particle formed when an atom loses or gains one or more electrons to become stable 3 of 13 Ionic bond Ionic bonds form when a metal transfers electrons to a non metal producing positive and negative ions 4 of 13 Covalent bonds A covalent bond is formed when 2 non metal atoms share an electron pair to obtain a stable electron 5 of 13 Molecule A molecule is 2 or more atoms covalently bonded 6 of 13 Alloys An alloy is a mixture of 2 or more elements at least one of which is a metal 7 of 13 Nanoparticles A nanoparticle is a structure that is 1-100nm in size, they contain a few hundred atoms 8 of 13 Element An element is made up of only 1 type of atom 9 of 13 Melting point A melting point is the temperature at which a solid changes to a liquid 10 of 13 Boiling point A boiling point is the temperature at which a liquid changes to a gas 11 of 13 Relative atomic mass The relative atomic mass of an element is a weighed mass of the isotope of the element compared to that of carbon 12 which has a mass of exactly 12 12 of 13 Pure substance A pure substance has a sharp, specific melting and boiling point 13 of 13
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