Newland's Law of Octaves was applicable upto which element? 

Calcium 

The correct answer is option 3. Calcium.

Newland's Law of Octaves was applicable up to the element calcium (Ca). This law was proposed by John Newlands in 1865 and suggested that when elements are arranged in order of increasing atomic mass, every eighth element displayed similar properties. This concept was inspired by the musical octaves, where every eighth note shares similar characteristics. However, Newland's Law of Octaves was only applicable up to calcium; beyond calcium, the pattern of similar properties every eighth element breaks down.