Who among the following was the first to find that every eighth element had properties similar to that of the first element?

Which classification law of chemical elements was proposed by J.A.R. Newlands in 1865?

Match the group numbers with their corresponding element family names: i. III A (Group 13) ii. IV A (Group 14) iii. VI A (Group 16) iv. VII A (Group 17) a. Chalcogen family b. Halogen family c. Boron family d. Carbon family