He's got this beard game sortedNationality RussianField: ChemistryContributions By realising that, when listing the elements by atomic mass the same behaviour repeated itself perodically; Mendeleev sort of invented modern Chemistry by putting them all down in his Periodic Table of the Elements. Beard Another St. Petersburg classic (see Pavlov), Mendeleev couples the wild style with completely unkempt hair for a mad-genius look.