Q2 of 24 Page 85

Besides gallium, which other elements have since been discovered for which gaps were left by Mendeleev in his periodic table? (any two)

Scandium (Sc) and Germanium (Ge) elements have been discovered for which gaps were left by mendeleev in his periodic table.


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What were the limitations of ' law of octaves ?

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Use Mendeleev's periodic table to predict the formulae for the oxides of the following elements : K, C, AI, Si, Ba

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What were the criteria used by Mendeleev in creating his periodic table ?

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Why do you think the noble gases are placed in a separate group ?