A) \[_{76}{{Y}^{287}}\]
B) \[_{77}{{Y}^{285}}\]
C) \[_{77}{{Y}^{281}}\]
D) \[_{77}{{Y}^{289}}\]
Correct Answer: C
Solution :
\[_{85}{{X}^{297}}{{\to }_{77}}{{Y}^{281}}+4\left( _{2}H{{e}^{4}} \right)\]
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