Question

what decides the position of the element in modern periodic table

Answer 1

Elements are arranged according to their atomic numbers in periodic table. Hence, It is the main basis for classification and assingning position to all elements.

Answer 2

The previous periodic table was organised with the help of atomic mass.

But In modern periodic table the position of elements is set by atomic number means the number of proton or electron present in the element.

It helped in reducing drawbacks of mendeleev periodic table.

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