Question

de-merits of Newlands law​

Answer 1

Explanation:

Newland could arrange elements only up to calcium, out of the total 56 elements known. After calcium, every eighth element did not possess properties similar to that of the first. Only 56 elements were known at the time of Newlands, but later several elements were discovered.

Answer 2

Answer:

Demerits of Newlands' octaves:

(1)Out of of the 56 elements known , Newlands law of octaves was applicable only upto calcium.

(2)In order to fit all the known elements, Newlands placed two elements in the same position.For example , Co and Ni , Ce and La. (3)Newlands' octaves did not have provision to accommodate the newly discovered elements.

Explanation:

After calcium, every eighth element did not possess similar properties to those of the first. He placed the metals Co and Ni, under the note 'Do' along with halogens, while Fe, having similarity with Co and Ni, away from them along with the nonmetals O and S under the note 'Ti.'