What is the Law of octave?

Answer 1

An old observation that predated and foreshadowed the concept of Periodicity.

John Newlands was an English chemist of the 19th century. I just read in a bio that he actually fought for Garibaldi in the wars for Italian unification, so he must have been quite a remarkable character. As a chemist he noted an apparent Periodicity in the chemistry of the then known elements, when arranged by order of their atomic masses. Every eight element was known to have similar chemistry, and thus the law of octaves, after the 7 notes on the musical scale.

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Answer 2

Naomi Aronson

The Law of Octaves asserts that properties of elements repeat after specific intervals, i.e., every eighth element, when elements are arranged by increasing atomic mass. The name comes from this pattern, which is similar to musical octaves.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.