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First 4 elements
Fire, water, earth, air
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How many known elements in 1828
53
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Who proposed TRIADS
Dobereiner
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What are TRIADS
Groups of 3 elements having similar properties, with the middle element having an atomic weight being the average of the other two
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Law of octaves
1864, Newlands organizing so it went by weight and paired them up by 8 elements
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Periodicity
A regular reoccurrence
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Meyer
Periodic Nature of atomic volume
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The periodic law
Mendeleev, the physical and chemical properties of the elements are periodic functions of their atomic weights
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Mendeleev
got credit for chemical and physical properties and left empty spots for undiscovered elements and predicted their properties. Minor problem b/csome of the elements were reversed pairs
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