What were the criteria used by Mendeleev's in creating his Periodic Table ?
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Medeleev used atomic mass of the elements as the unique criteria of the elements. He proposed that the chemical properties of elements are the periodic function of their atomic masses. And thus, he arranged the elements in the increasing order of their atomic mass.
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What were the criteria used by Mendeléey in creating his Periodic Table?
Mendeleev left some gaps in his periodic table.
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(a) Which two criteria did Mendeleev use to classify the elements in his periodic Table? (b) State Mendeleev's periodic law. ( c) Why could no fixed position be given to hydrogen in Mendeleev's Periodic Table ? (d) How and why does the atomic size vary as you go (i) from left to right along a period (ii) down a group ?
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