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...Atomic structure and periodic table details of the three sub fundamental particles particle position relative mass charge proton nucleus neutron electron orbitals there are various models for an atom lithium li can be represented as follows number symbol theatomic z is protons in themass a total neutrons isotopes atoms with same but different numbers definition isotopic one isotope compared to twelfth carbon have similar chemical properties because they electronic may slightly varying physical masses average molecular molecule spectrometer used determine all present sample element therefore identify elements calculating quoted on weighted fig spectra magnesium from each e mg c n measure m d ratio abundance u b if asked give species peak spectrum then g goalby chemrevise org sometimes two electrons r x removed forming ion would above example use these equations work out instead percentage this equation cl br has lead following caused by diatomic molecules measuring them h put through it...