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Newlands stated that there was a periodic similarity in properties of every eighth element in his system. However, today we see that for periods 2 and 3.
the similarity occurs in every ninth element. What is the reason? Explain.​

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Answer:

see explanation

Explanation:

Newlands published his periodic table in 1864. He was a British analytical chemist.

His table was quite incomplete. He based the table on the so called "law of octaves" which states that the properties of elements are similar after each eight element.

This was possible because the noble gases were not yet discovered. After the discovery of the noble gases, similar properties of elements can only occur after every ninth element.

Due to incomplete periodic table the Newlands theory of octaves was rejected.

  • The main reason for this difference is that the periodic table was incomplete and with the discovery of more elements rejected the law of octaves presented by Newlands.
  • Newlands arranged the table on the basis of "law of octaves" which states that the properties of elements are similar after each eight element.
  • But with the discovery of new elements, this law was rejected and modern periodic table states that the properties of elements are similar after every nine element so we can conclude that due to incomplete periodic table the Newlands theory of octaves was rejected.

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