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A radium Ra88^224 isotope, on emission...

A radium `Ra_88^224` isotope, on emission of an `alpha`-particle gives rise to a new element whose mass number and atomic number will be:

A

220 and 86

B

225 and 87

C

228 and 88

D

224 and 86

Text Solution

Verified by Experts

The correct Answer is:
A
When an `alpha`-particle is emitted by any nucleus then atomic weight decreases by four units and atomic number decreases by two units
`""_(83)Ra^(224) overset(-alpha)to ""_(86)X^(220)`
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