Atomic Number, The number of protons in an atom, Mass Number, The number of protons and neutrons in the nucleus of an atom, Relative Atomic Mass, The average mass of an atom of an element relative to 1/12 of the mass of an atom of carbon-12, Relative Isotopic Mass, The average mass of an atom of an isotope of an element relative to 1/12 of the mass of an atom of carbon-12, Isotopes, Atoms which have the same atomic number but a different mass number (contain the same number of protons but a different number of neutrons), Relative formula mass, The average mass of a formula unit relative to 1/12 of the mass of an atom of carbon-12, Relative Molecular Mass, The average mass of a molecule relative to 1/12 of the mass of an atom of carbon-12, First Ionisation Energy, The energy required to convert one mole of gaseous atoms gaseous ions with a single positive charge, Second Ionisation Energy, The energy required to convert one mole of gaseous ions with a single positive charge into gaseous ions with a double positive charge, Third Ionisation Energy, The energy required to convert one mole of gaseous ions with a double positive charge into gaseous ions with a triple positive charge, Covalent bond, The electrostatic attraction between a shared pair of electrons and the nuclei of bonded atoms, Co-ordinate (dative) bond, A shared pair of electrons between two atoms. One atom provides both electrons, Octet rule, When reacting, an atom tends to gain, lose or share electrons to achieve eight in its outer shell, Electronegativity, The extent to which an atom attracts the bonding electrons in a covalent bond, Polar bond, A covalent bond in which there is unequal sharing of the bonding electrons, Delocalised electrons, Outer electrons do not have fixed positions but move freely, Intermolecular, Between neighbouring molecules, Van der Waal's forces, The attraction between instantaneous and induced dipoles on neighbouring molecules, Permanent dipole-dipole attraction, Attraction between the positive end of the permanent dipole on a molecule with the negative end of the permanent dipole of a neighbouring molecule, Hydrogen bond, The attraction between a lone pair of electrons on a very electronegative atom in one molecule and a hydrogen atom in a neighbouring molecule, in which the hydrogen atom is covalently bonded to a very electronegative atom (N, O, F), Redox, Oxidation and reduction occur in the same reaction, Oxidation, Loss of electrons/Increase in oxidation state, Reduction, Gain of electrons/Decrease in oxidation state, Oxidising agent, Electron acceptor, Reducing agent, Electron donor, Disproportionation, Oxidation and reduction of the same element in the same reaction, Strong acid/base, Fully dissociates in solution, Weak acid/base, Partially dissociates in solution, Molarity, Concentration in moldm-3, expressed as M, Concentration, Number of moles or mass present in a stated volume, Standard solution, A solution for which the concentration is known

AS Module 1 Definitions

by
Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?