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State Newland's law of Octaves?

The English chemist, John Alexander Reina Newland was one of the first to detect a periodic order in the properties of elements.
In 1865, he gave Law of Octaves that, if atoms are arranged according to increase in atomic weight, those with same physical and chemical properties occur after each interval of seven elements. That is every eighth element will be similar as that of first.

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John Newlands was an English scientist, who arranged the elements in the order of increasing atomic masses. He started with the element having the lowest atomic mass (hydrogen) and ended at thorium which was the 56th element. He found that every eighth element had properties similar to that of the first, like the octaves found in music. He called this the Law of Octaves. Thus the Newland's law of octaves states that

'When elements are arranged in the order of increasing atomic masses, the properties of every eighth element are similar to that of the first' . For example, the properties of lithium and sodium were found to be the same. Sodium is the eighth element after lithium. Similarly, beryllium and magnesium resemble each other.

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