Question

List one advantage and one dissadvantage of all the three attempts of periodic tables given by dobereiner,newland and mendeleev

Answer 1

Answer:

Step-by-step explanation:

Dobereiner

*law of triads didn't hold for elements beyond potassium

*formed basis of grouping elements

Newland

*Law of octaves not valid after calcium

*formed basis of grouping

Mendeleef

*incorrect atomic weight

*elements in same group had same valency