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Question
Identify [A] and [B] in the following:
22789Ac−β−−−−−→[A]−α−−−−−→[B]−α−−−−−→Rn
Identify [A] and [B] in the following:
22789Ac−β−−−−−→[A]−α−−−−−→[B]−α−−−−−→Rn
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Solution
The correct option is B Th,Ra
22789AC−β−→22790[A]−α−−→22388[B]−α−−→21986Rnα-decay
AZX−α−−→A−4Z−2Y
β-decay
AZX−β−→AZ+1Y
∙element with Z=90 is Thorium (Th)
∙element with Z=88 is Radium (Ra).
∴[A] and ]B] are Th and Ra respectively.
22789AC−β−→22790[A]−α−−→22388[B]−α−−→21986Rn
α-decay
AZX−α−−→A−4Z−2Y
β-decay
AZX−β−→AZ+1Y
∙element with Z=90 is Thorium (Th)
∙element with Z=88 is Radium (Ra).
∴[A] and ]B] are Th and Ra respectively.
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