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.(90)Th a member of III group on losing ...

`._(90)Th` a member of `III` group on losing `alpha-` particles forms a new element belonging to:

A

`I` group

B

`III` group

C

`II` group

D

`IV` group

Text Solution

Verified by Experts

The correct Answer is:
`(c)`
`._(90)^(232)Th rarr ._(88)^(228)Ra + ._(2)^(4)He`,
Elements 89 to 103 are placed in `III` group.
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P BAHADUR-RADIO ACTIVITY-Exercies 3A
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  11. The isotope used to find the age of series:

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  16. The parent nucleus of (4n + 3) seires is:

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  18. A radioactive istope having a half-line of 3 day was received after 12...

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