Demokritos (460 – 370 f. Kr)
A´tomos = odelbar
Aristotelse (384 – 322 f. Kr)
LUFT ELD JORD VATTEN Aristoteles fyra grundelement
John Dalton (1766 – 1844)
Jöns Jacob Berzelius (1779 – 1848)
Dmitrij Mendelejev (1834 – 1907)
PROTON (+) NEUTRON (Neutralt laddad) ELEKTRON (-)
Ernest Rutherford (1871 – 1937)
Niels Bohr (1885 – 1962)
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