Atomic Structure Key Definitions 0.0 / 5 ? ChemistryAtomic StructureASAQA Created by: JasmineRCreated on: 05-11-15 21:17 Relative atomic mass The average mass of an atom compared to one twelfth of the mass of an atom of carbon 12. 1 of 11 Relative molecular mass The average mass of a molecule compared to one twelfth of the mass of one atom of carbon 12. 2 of 11 Isotope Atoms with the same number of protons (and electrons) but different numbers of neutrons. 3 of 11 Proton number The number of protons in the nucleus of an atom; the same as the atomic number. 4 of 11 Molecular ion In mass spectrometry this is a molecule of the sample which has been ionised but which has not broken up during its flight through the instrument. 5 of 11 Strong nuclear force The force that holds protons and neutrons together within the nucleus of the atom. 6 of 11 Atomic orbital A region of space around an atomic nucleus where there is a high probability of finding an electron. 7 of 11 Mass number The total number of protons plus neutrons in the nucleus of an atom. 8 of 11 Ions Positive or negative atoms that have lost or gained electrons. 9 of 11 Atomic number The number of protons in the nucleus of an atom (same as the proton number). 10 of 11 Ionisation energy The energy required to remove a mole of electrons from a mole of isolated gaseous atoms or ions. 11 of 11
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