Which of the following statement(s) state the drawbacks of Mendeleev's periodic table accurately?

(i) No place is assigned for isotopes

(ii) Lanthanides and actinides do not follow Mendeleev’s periodic law

(iii) No well-defined position for hydrogen

Dmitri Mendeleev designed the periodic table by arranging the elements in the increasing order of their atomic weights.

Demerits of Mendeleev's periodic table are:

• Position of hydrogen was not justified.
• The position of isotopes was not determined, since they have the same atomic number but different atomic mass numbers.
• Lanthanides and actinides do not follow Mendeleev’s periodic law, their position was anomalous