In 1866, John Newlands, an English scientist, arranged the then known elements in the order of __________. It is known as 'Newlands' Law of Octaves'.

Key Points

• In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses.
• This arrangement is known as Newlands' Law of Octaves.
• According to this law, every eighth element had properties similar to that of the first, much like the octaves in music.
• Newlands' Law of Octaves was one of the earliest attempts to classify elements based on their properties and atomic masses.
• This law was applicable only up to calcium, as beyond calcium, the properties of elements did not match the pattern.

Additional Information

• John Newlands' classification was an important step towards the development of the modern periodic table.
• Later, Dmitri Mendeleev and others improved upon Newlands' ideas, leading to the periodic table we use today.
• The periodic table is now based on the increasing atomic number, not atomic mass.
• Newlands' work demonstrated the periodicity of elements' properties, which is a fundamental concept in chemistry.