Unit 1 Module 1 0.0 / 5 ? ChemistryCalculationsASOCR Created by: AminaaDCreated on: 02-12-13 12:10 Isotopes Atoms of the same element with different numbers of neutrons but the same number of protons. 1 of 5 Relative Atomic Mass Average weighted mean mass of an atom relative to 1/12 of the mass of a carbon-12 atom. 2 of 5 Relative Isotopic Mass The mass of an isotope of an element compared with the mass of 1/12 of an atom of carbon-12. 3 of 5 Orbital A region that can hold up to two electrons with opposite spins. 4 of 5 First Ionisation Energy The energy required to remove one electron from each atom of 1 mole of gaseous atoms to form one mole of +1 ions. 5 of 5
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