Question

Any help plz

4.
What was the basis of classification of element in the long form of the periodic table? |​

Answer 1

Answer:

Dmitri Mendeleev : HE gave periodic table on the basis of atomic mass

MOSELEY : after discovery of atomic no by moseley PERIODIC table was renewed ..

MODERN PERIODIC TABLE IS CLASSIFIED ON THE BASIS OF ATOMIC NUMBER ...

Explanation:

   MODERN PERIODIC TABLE STATES THAT :

          "  If elements are arranged according to their increasing atomic

           then their physical and chemical properties repeat in a

           periodic manner    "

IN MODERN PERIODIC TABLE :

      There are eight Groups

      There are seven Periods

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Answer 2

Answer:

Physical and chemical properties of the elements are a periodic function of their atomic numbers.

Explanation: