Question

Notes on New lands law of Octaves

Answer 1

Law of Octaves was found applicable upto Calcium. After calcium every eighth element did not possess properties similar to that of first one. 
Therefore, the correct answer is (b) Calcium

Answer 2

Newlands grouped elements in a group of eight elements in which first element resembled the property of every 8th elements. In this table elements were grouped in a group of eight which resembled with the music note do re mi fa so la ti which ends with the same word do and starts with the same word which was same as his table so it was named law of octaves. When Newlands make this table 56 elements were known, but there are some demerits of this table, after calcium every eighth element do not exhibit the rule of this table moreover at that time only 56 elements were known later many elements were discovered so there was no more the importance of this table.