Chemistry AS F321 Definition Definitions you need to know for the F321 exam :) 3.5 / 5 based on 2 ratings ? ChemistryASOCR Created by: Miranda BalfeCreated on: 09-05-13 20:27 Acid Species that is a proton donor 1 of 21 alkali Type of base that dissolves in water to form OH- ions 2 of 21 anhydrous Substance containing no water molecules 3 of 21 Atomic orbital Region within an atom that can hold up to two electrons 4 of 21 Avogadro's Constant number of atoms per mole of the carbon-12 isotope (6.02x10^23) 5 of 21 Base Proton acceptor 6 of 21 Covalent bond bond formed from a shared pair of electrons 7 of 21 Electronegativity Measure of the attraction of a bonded atom for the pair of electrons in a covalent bond 8 of 21 Group vertical column in periodic table. Elements in the same group have similar properties and the same number of outer electrons 9 of 21 Hydrated Water of crystallisation 10 of 21 Ion postively or negatively charged atom or group of atoms 11 of 21 Ionic Bond Electrostatic attraction between oppositely charged ions 12 of 21 First ionisation energy Energy required to remove one electron from each atom in one mole of gaseous atoms to form 1 mole of gaseous 1+ ions 13 of 21 Isotopes Same element, different number of neutrons 14 of 21 Metallic Bond electrostatic attraction between positive ions and delocalised electrons 15 of 21 Oxidation Loss of electrons or increase in oxidation number 16 of 21 Periodicity regular periodic variation of properties of elements with atomic number and position in the periodic table 17 of 21 Relative atomic mass (same for isotopic/molecular just swap words over) Weighted mean mass of an atom of an element compared with one twelth of the mass of an atom of carbon-12 18 of 21 Salt H+ ion from an acid has been replaced with a metal or positive ion 19 of 21 Sub Shell group of the same type of atomic orbitals within a shell 20 of 21 van der Waals' forces Weak attractions between induced dipoles in neighbouring molecules 21 of 21
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