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1.4 Elements of Life
Dimitri Mendeleev

Ordered the periodic table by relative atomic mass rather than proton number
Left gaps for elements he predicted would be discovered
Was proved right when germanium was discovered and had all the properties he had predicted

Periodicity












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Isotope Atom with same number of protons but different neutrons


Relative atomic mass Mass of an atom relative to 12 C = 12 exactly
Cation Molecule or atom that has lost 1 or more electrons
Nuclear Fusion 2 nuclei joining to make 1 heavier nucleus


1st Ionisation Enthalpy Energy required…

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