What physical and chemical properties of elements were used by mendeleev in creating his periodic table?. List two observations which posed a challenge to mendeleev periodic law
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Two observations which posed a challenge to Mendeleev's Periodic Law: Position of the isotopes: The isotopes of the elements have different atomic masses. So, isotopes must occupy different positions in the periodic table.
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Explanation:
Two observations which posed a challenge to Mendeleev's Periodic Law: Position of the isotopes: The isotopes of the elements have different atomic masses. So, isotopes must occupy different positions in the periodic table
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