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...An introduction to general inorganic chemistry mendeleev s periodic table of the elements dmitri born in soviet union he organised known into a based on atomic masses predicted existence and properties unknown pointed out accepted weights that were error is thus arrangement order increasing number are arranged rows called periods with similar placed same column these columns groups modern day can be further divided blocks http www chemsoc org viselements pages html p d f this course only deals block concerned filling orbitals contains i ii which have recently been named iii viii exist because electronic configurations within each group valence configuration type exhibited by element reliant electrons displayed given physical elemental also related as illustrated following four examples ionisation energy first e g if required remove one electron from gaseous plotted against definite pattern appears st energies vary systematically increase across period decrease down why...