2 Atomic structure 2.0 / 5 based on 1 rating ? ChemistryBonding & shapesInternational BaccalaureateAll boards Created by: Jasmine ClarkeCreated on: 10-04-13 16:21 Compound Substance made by chemically combining two or more elements. 1 of 11 Atomic number Defined as number of protons in nucleus (and number of electrons) 2 of 11 Mass number Defined as the number of protons and neutrons in an atom. 3 of 11 Isotopes Atoms of the same element with different mass numbers. 4 of 11 Cations Positive ions (atom that has lost electron/s) 5 of 11 Anions Negative ions (atom that has gained electron/s) 6 of 11 First ionisation energy The energy needed to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions. 7 of 11 Hund's rule If more than one orbital in a sub-level is available, electrons occupy different orbitals with parallel spins. 8 of 11 Pauli exclusion principle no more than two electrons can occupy any one orbital, and if two electrons are in the same orbital they must spin in opposite directions. 9 of 11 Electron arrangement The number of electrons in each MAIN energy level. 10 of 11 Electron configuration The number of electrons in each SUB-LEVEL. 11 of 11
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