A nucleus of uranium, ${}_{92}^{235}U$, undergoes a series of decays. During the series of decays, two ${\alpha ^ - }$ particles and one ${\beta ^ - }$ particle are emitted.
As a result, a nucleus of actinium, Ac, is formed.
What is the correct notation for the nuclide of actinium that is formed?
1 )
${}_{87}^{227}Ac$
${}_{89}^{227}Ac$
3 )
${}_{87}^{231}Ac$
4 )
${}_{89}^{231}Ac$
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