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The number of alpha-particles emitted by...

The number of `alpha`-particles emitted by
`""_(84)^(218)Ra rarr ""_(82)^(206)Pb` is

A

3

B

4

C

6

D

2

Text Solution

Verified by Experts

The correct Answer is:
A
`""_(84)^(218)Ra rarr ""_(82)^(206)Pb + x""_(2)^(4)He + y ""_(-1)^(0)e`
Compare the mass number
`218 = 206 + 4x`
`4x=218-206`
`4x=12`
`x=(12)/(4)=3`
`alpha`-particle emitted, x=3
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