Question

how do modern periodic table overcome the demerits made by mendeleev s

Answer 1

1).IT STATES THAT THE PROPERTIES OF AN ELEMENT ARE DETERMINED BY THE PERIODIC FUNCTION OF THERE ATOMIC NO. NOT ATOMIC MASS.
2).A CORRECT POSITION OF ISOTOPES IS EXPLAINED.
3).CORRECT ORDER FOR ARGON AND POTASSIUM.
4).PLACE FOR NOBLE GASES..