A- Level Chemistry This covers all topic of the OCR chemistry A-level UK. 3.0 / 5 based on 6 ratings ? ChemistryASAll boards Created by: Alice LeeCreated on: 17-11-11 17:33 What is an Isotopes? Atoms of the same element with different number of neutrons 1 of 5 what is an Ions? positively or negatively charged atom or covalently bonded group of atoms(a molecular ion). 2 of 5 What is Relative isotopic mass is the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon -12 3 of 5 what is ionisation energy? is the energy need to form positive ions 4 of 5 what is an atomic orbital? is a region within an atom that can hold up to two electrons, with opposite spins 5 of 5
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