Question

why there is need to classify element?

Answer 1

because all have different atomic masse and different Valencise and properties

Answer 2

Hey mate!!!!

✔ur answer is here.......

⏩In PT there are 118 elements individually we can't read about each and every atom.
On the basis of chemical properties, physical properties we classifie elements in PT.

We classify elements in Grouos and Periods.
There are 7 periods and 18 groups in periodic table.