Q2
Kindly refer to the link given below:-
https://www.meritnation.com/ask-answer/question/state-the-modern-periodic-law-what-is-the-modern-periodic-ta/periodic-classification-of-elements/3510359
https://www.meritnation.com/ask-answer/question/merits-and-dimerits-of-mendeleev-s-periodic-table/periodic-classification-of-elements/579792
https://www.meritnation.com/ask-answer/question/state-the-modern-periodic-law-what-is-the-modern-periodic-ta/periodic-classification-of-elements/3510359
https://www.meritnation.com/ask-answer/question/merits-and-dimerits-of-mendeleev-s-periodic-table/periodic-classification-of-elements/579792