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HISTORY OF THE PERIODIC TABLE.
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INTRODUCTION.
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Mendeleev’s Periodic Law. The properties of elements are periodic functions of their atomic masses.
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Mendeleev’s Periodic Table. Periodic Table of Elements based on Mendeleev's Periodic Law 40 202 (222) 1.01 Li 6.94 23.0 197 (223) Be 9.01 24 Ill B 10.8 27.0 •c 12.0 Si 28.1 232 v N 14.0 31.0 O 16.0 32.1 VII F 19.0 35.5 (210) (226) (227) 209 (210) opa U 231 238 VIII Lanthanide series Actinide series Known to Ancients Dobereiner's triads 3roate-d North Carolina School of Scient*? and Mathematics Known to Mendeleev.
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Mendeleev’s Periodic Table - Merits. 1 – Elements classified by atomic masses and properties 2 - Vacant Spaces for unknown elements 3 - H elped discovery of new elements by predicting their properties 4 – I nert gases discovered later could be placed in a separate group.
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Mendeleev’s Periodic Table - Defects. 1 – Some elements not classified in order of atomic masses 2 - The position of Hydrogen is not clear 3 – The position of isotopes of elements are not clear.
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Conclusion. Mendeleev’s periodic table formed the framework for the modern periodic table..
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Thank You.