निम्नलिखित में से किसने सबसे पहले यह पाया था कि प्रत्येक आठवें तत्व के गुण पहले तत्व के गुणों के समान थे?

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