There were 62 elements at the time of Newland's classification and it was arranged in 8×7 arrangements with 2×3 in other positions. i.e. 2 elements were arranged in 3 sets..

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Introduction to Newlands' Law of Octaves
Newlands' Law of Octaves was proposed by the British chemist John Newlands in 1865. This law states that when elements are arranged in order of increasing atomic mass, every eighth element exhibits similar properties, akin to the musical scale's octave. This was one of the earliest attempts at classifying elements and laid the groundwork for the modern periodic table.

Number of Known Elements
As of now, there are 118 confirmed chemical elements, with atomic numbers ranging from 1 (Hydrogen) to 118 (Oganesson). These elements include:
- **Metals**: Majority of the elements are metals, including alkali metals, alkaline earth metals, transition metals, and post-transition metals.
- **Non-metals**: Elements such as Carbon, Nitrogen, Oxygen, Phosphorus, and Sulfur fall under this category.
- **Metalloids**: Elements that have properties of both metals and non-metals, like Silicon and Germanium.

Significance of Newlands' Law
- **Periodic Trends**: It helped in identifying periodic trends in element properties, leading to the development of the periodic table.
- **Group Classification**: Newlands’ work introduced the idea of grouping elements with similar properties, paving the way for later scientists.
- **Limitations**: Although significant, the law had its limitations. For example, it did not accommodate elements discovered after Newlands' time and failed for some heavier elements.

Conclusion
Newlands' Law of Octaves may seem simplistic by today’s standards, but it was a crucial step in the evolution of the periodic classification of elements. Understanding it provides insight into how scientists moved towards a more comprehensive periodic table, ultimately contributing to the field of chemistry.