Question

differentiate between Mendeleev's periodic table and modern periodic table.

Answer 1

•Mendeleev could not assign a correct position to hydrogen in his table whereas, In the modern periodic table hydrogen in placed in a separate position

•In the modern periodic table elements are classified in the increasing order of atomic number whereas in Mendeleev's

the elements are classified in the increasing order of atomic mass

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Answer 2

Mendeleev's periodic table

✩elements r arranged in the order of atomic mass.

✩there r nine columns called groups.

✩transition elements r placed together in a group 8.

✩there r 6 periods.

modern periodic table

★elements r arranged in the order of increasing atomic number.

★there r eight vertical columns.

★transition elements in the middle of long periods.

★there r 7 periods.

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