Question

what is difference between mendleev periodic law and modern periodic law

Answer 1

In modern periodic table, the elements are arranged in order of increasing atomic number.
In mendeleev's table, they were arranged in order of increasing atomic weight.

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Answer 2

Mendeleev's periodic law

Mendeleev's periodic table is based on atomic mass.
Mendeleev's periodic table contains about 66 elements.
In Mendeleev's periodic table there where gaps for undiscovered elements.
In Mendeleev's periodic table noble gases where not placed.
In Mendeleev's periodic table transition elements included with other elements.

Modern periodic low

Modern periodic table is based on atomic number.
Modern periodic table contains about 112 elements.
Modern periodic table maintains uniformity.
In Modern periodic table noble gases in a separate named as group-18.
In Modern periodic table transition elements placed in separate block.

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