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BITSAT2017ChemistryClassification of Elements and Periodicity in PropertiesActual

Consider the following radioactive decays I. U 92 ⟶ - α 90 Th and II. 90 Th ⟶ - α Ra 88 In which case group of parent and daughter elements remains unchanged.

Options

  1. AIn ( I )
  2. BIn ( II )
  3. CBoth in ( I ) and ( II )
  4. DNone of the above

Correct answer

A. In ( I )

Step-by-step solution

For the following radioactive decays I. U 92 ⟶ - α 90 Th and II. Th 90 ⟶ - α 88 Ra In both Uranium and Thorium belongs to IIIB group. ∵ Elements with atomic number 90 to 103 belongs to same group, i.e. III - B 3 rd group (i.e. actinoids).

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