Chemistry Atoms and Reactions 3.0 / 5 based on 1 rating ? ChemistryReactionsASOCR Created by: Ollie Short (momo)Created on: 02-04-13 12:47 Proton Charge = 1+, Relative mass = 1, In nucleus 1 of 13 Neutron Charge = 0, Relative mass = 1, In Nucleus 2 of 13 Electron Charge = 1-, Relative mass = 1/2000, In orbitals around nucleus 3 of 13 Isotope Atom of the same element with a different number of neutrons 4 of 13 Ion A positive or negatively charged atom or group of covalently bonded atoms 5 of 13 Atomic (proton) number Bottom, number of protons 6 of 13 Mass (nucleon) number Top, number of protons + neutrons 7 of 13 Relative Atomic mass The weighted mean mass of an atom of an element compared to 1/12 the mass of a C12 atom 8 of 13 Relative Isotopic mass The mass of an isotope compared to 1/12 the mass of a C12 atom 9 of 13 Relative Molecular mass The weighted mean mass of a molecule compared to 1/12 the mass of a C12 atom 10 of 13 Relative Formular mass The weighted mean mass of a formula unit compared to 1/12 the mass of a C12 atom 11 of 13 RMM example... H2O (1.0x2) + 16.0 = 18.0 12 of 13 RFM example... Na3PO4 (23.0x3) + 31.0 + (16.0x4) = 164.0 13 of 13
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