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A nucleide of an alkaline earth metal un...

A nucleide of an alkaline earth metal undergoes radioactive decay by emission of three a-particles in succession. The group of the periodic table to which the resulting daughter element would belong is:

A

Group 4

B

Group 6

C

Group 14

D

Group 16

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The correct Answer is:
C
When II A group element (Ra) emits one `alpha`- particle its group no. decreases by two units i.e. goes into zero group (group 18). But it is also radioactive and due to successtion emission, last product is Pb i.e. (Group 14).
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