Question

Mention any two anomalies of mendeleev's periodic table

Answer 1

The Modern Periodic Tablecould remove various anomalies of Mendeleev�s Periodic Table: ... c) All isotopes of the same elements have different atomic masses, but same atomic number; therefore they are placed in the same position in the modern periodic table.

Answer 2

1) He couldn't explain the position of hydrogen He couldn't explain the position of isotopes of some elements

 Since his table was based on the virtue of atomic mass,

- He couldn't explain why some elements with more atomic mass were placed before the ones with less mass.

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