Which of the following is the last element in the Newlands Law of Octaves classification?

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RRB ALP Previous Paper 1 (Held On: 9 Aug 2018 Shift 1)
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  1. Radium
  2. Thorium
  3. Iron
  4. Rhodium

Answer (Detailed Solution Below)

Option 2 : Thorium
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Detailed Solution

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  • Newlands Law of Octaves classification attempted to arrange elements by the atomic weight
  • According to Newlands Law of Octaves classification, the eighth element starting from the given one kind is a repetition of the first element in the given kind
  • This is similar to the property of musical notes
  •  The eighth element would have similar atomic weight as that of the first one
  • In this way, Thorium was the last element in the Newlands Law of Octaves classification

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