Question

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​

Answer 1

Answer:

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.

Answer 2

Answer:

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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