Atomic Number:- the number of protons in an atom
Mass Number:- the number of protons and neutrons in an atom
Isotopes:- atoms of the same element with the same number of protons but different numbers of neutrons
Weighing Atoms:- standard mass = 1/12th mass of one atom of carbon 12
Relative Isotopic Mass:- mass of one atom of an isotope relative to 1/12th of one carbon 12 atom
Relative Atomic Mass:- weighted average mass of one atom, relative to 1/12th mass of one atom of carbon 12
Relative Molecular Mass:- weighted average mass of one molecule relative to 1/12th of one atom of carbon 12
1st Ionisation energy:- energy required to remove 1 electron from each atom is 1 mole of atoms of an element
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