Question

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element
(a) potassium
(b) calcium
(c) cobalt
(d) phosphorus

Answer 1

Answer:

calcium

Explanation:

after calcium that is the heavier elements did not follow the law of octaves.

it worked well with lighter elements

Answer 2

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element calcium.

Explanation:

The Newland's octave law for classifying elements applied only up to the calcium element.

Newland's law:-

Where the chemical elements are grouped by the atomic weight, those with identical chemical and physical characteristics occur during each seven-element intervals.  

Calcium :- Calcium is a chemical compound containing the number 20 and the sign Ca. Calcium is metal which is reactive, as an alkaline earth metal, which forms a dark oxide-nitride coating when exposed to the air. Its chemical and physical characteristics are closest to those of its heavier strontium and barium homologues.  

Therefore the correct answer is Option (b) calcium