(a) State Mendeleev's periodic law. What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev's classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in the periodic table? (e) Which group of elements was missing from Mendeleev's original periodic table?

(a) State Mendeleev's periodic law. What chemical properties of eleme

1.	(a) State Mendeleev's periodic law. What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev's classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in the periodic table? (e) Which group of elements was missing from Mendeleev's original periodic table?
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