A) \[^{61}Co\]
B) \[^{60}Ni\]
C) \[^{59}Ni\]
D) \[^{60}Cu\]
Correct Answer: B
Solution :
Key Idea: (i) The sum of atomic masses of reactants = the sum of atomic masses of products (ii) The sum of atomic number of reactant = the sum of atomic number of products (iii) \[\beta \]-particles is electron and loss of \[\beta \]-particle results in increases in atomic number by 1 and atomic mass remains same \[_{27}^{60}Co\xrightarrow{{}}\underset{\beta \text{ }particle}{\mathop{_{28}^{60}Ni+_{-1}^{0}e}}\,\]
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