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Russian Chemist DIM
taught chemistry in terms of properties, wrote down the elements in order of increasing mass, found some gaps, and predicted their properties before they were found.
Group 1 properties
metals, 1 valence electron, very reactive, soft, silver, shiny, low density (excluding hydrogen).
Group 2 properties
metals, 2 valence electrons, very reactive, less reactive than alkali metals, silver, more dense than alkali metals.
Group 3-12 properties
metals, 1 or 2 valence electrons, less reactive than alkaline-earth metals, shiny, good conductors of thermal energy and electric current, higher densities, melting points than elements in groups 1 and 2, and solid at room temperature except Mercury.
Group 17 properties
nonmetals, 7 valence electrons, very reactive, poor conductors of electric current, react violently with alkali metals to form salts, never found uncombined in nature.
Group 18 properties
nonmetals, 8 valence electrons, nonreactive, colorless, odorless gases at room temperature.
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