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BITSAT 2017
Exam
BITSAT
Year
2017
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2017 · Chemistry · Classification of Elements and Periodicity in Properties

Consider the following radioactive decays I. U 92 - α ⟶ 90Th and...

Consider the following radioactive decays

I. U92⟶−α90ThU 92 \overset{- \alpha}{⟶}90Th and

II. 90Th⟶−αRa88{}_{90}Th\overset{- \alpha}{⟶} Ra 88

In which case group of parent and daughter elements remains unchanged.

Options

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

Correct answer

A. In (I)( I )

Step-by-step solution

For the following radioactive decays

I. U92⟶−α90ThU 92 \overset{- \alpha}{⟶}90Th and
II. Th90⟶−α88RaTh 90 \overset{- \alpha}{⟶}88Ra

In& both Uranium and Thorium belongs to IIIB group.

∵∵ Elements with atomic number 9090 to 103103 belongs to same group, i.e. III−B3rdIII - B3rd group (i.e. actinoids).

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