Question

how many elements were known when newland gave this law​

Answer 1

Answer :

• 62 elements were known or thought to be existed when Newlands gave his law of octaves.

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Additional Information :

• John Newlands was an english scientist and he put forward the law of octaves in 1864.

• Law of octaves got its name from the octaves found in the Indian system of music.

• The 'Law of Octaves' states that if the elements are arranged in the order of their increasing atomic masses. Then, the chemical properties of every eighth element will be similar to that of the first.

• Example: Sodium, which is the eighth element appearing after lithium has the same chemical properties as of lithium.

• However, Newland's Law of Octaves worked only with lighter elements. Hence, this law was only applicable till calcium.

• Due to further more reasons, the Law of Octaves became irrelevant.

Answer 2

Answer:

56 elements

Newlands law of octaves state that, when elements are arranged in increasing order of their atomic masses then the properties of every eighth element is similar to its first. In 1865, an English chemist John Newlands stated a theory known as the Newland's law of octaves. At that time only 56 elements were known.