Chemistry Definistions 0.0 / 5 ? ChemistryAll LevelsOCR Created by: HannahCreated on: 24-04-13 12:21 Anion A Negatively charged Ion 1 of 15 Atomic Orbital A region of an atom that can hold up to two electrons 2 of 15 Cation A positively charged ion 3 of 15 Elector Negativity A measure of the attraction of a bonded atom for the pair of electrons in the covalent bond 4 of 15 Electron Shielding the repulsion between electrons in different inner shells. Shielding reduces the attraction from the nucleus 5 of 15 Empirical Formula the simplest whole number ratio of atoms of each element present in a compound 6 of 15 First Ionisation Energy The engery required to remove on mole of electrons from one mole of a gasius ion 7 of 15 Isotopes Atoms of the same element with different numbers of neutrons and differen masses 8 of 15 Oxidation Number A measure of the number of electrons that an atom uses to bond with another atom of other elements 9 of 15 Relative Atomic Mass The weighed mean mass of an element compared with one twelth of a Carbon-12 atom 10 of 15 Sub-Shell A group of the same type of atomic orbitals (s,d,p,f) within a shell 11 of 15 Van Der Wall's forces Very weak attractive forces between induced dipoles in neighbouring molecules 12 of 15 Dipole The separation of charges within a molecule between two covalently bonded atoms. 13 of 15 Covalent Bond A shared pair of electrons, one electron being supplied by each atom either side of the bond 14 of 15 Ionic Bond Oppositely charged ions held together in a crystal lattice by electrostatic attraction 15 of 15
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