Mendeleevs periodic table 1872 6 mendeleev used this

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Mendeleev’s periodic table (1872) 6 Mendeleev used this his organization of elements to predict properties of elements that had yet to be discovered: For example: Germanium Property Predicted (1871) Observed (1876) Atomic mass 72 g mol -1 72.3 g mol -1 Density 5.5 g cm -3 5.47 g cm -3 Oxide formula RO 2 GeO 2 Chloride formula RCl 4 GeCl 4
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Modern periodic table 7 1A 2A 3B 4B 5B 6B 7B (------8B--------) 1B 2B 3A 4A 5A 6A 7A 8A
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Some key groups with (characteristic) characteristics: 1A (1): alkali metals 2A (2): alkaline earth metals 7A (17): halogens 8A (18): noble gases Group characteristics 8 Periods = rows Groups = columns There is similar chemistry among elements of the same group
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Li, Na, K, Rb, Cs Soft, shiny, low melting point metals metal + H 2 O alkali ne solution Ionize to 1+ charge 1A (1): alkali metals 9
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Be, Mg, Ca, Sr, Ba, Ra Lustrous, silvery metals Reactive Ionize to 2+ charge 2A (2): alkaline earth metals 10
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F, Cl, Br, I Corrosive, reactive non-metals Ionize to -1 charge 7A (17): halogens 11
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He, Ne, Ar, Kr, Xe, Rn Low reactivities 8A (18): noble gases 12
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Periodic table 13 s -block d -block f -block p -block
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Periodic table 14 Main group elements Lanthanides Actinides Transition metals
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