Question

Cesium-137 decays to barium-137. The correct reactions for following decay process is :

• A. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{0}e$
• B. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{1}e$
• C. ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_1^{0}e$
• D. None of these

Answer 1

The correct option is A ${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{0}e$

For balanced reaction, mass and charge of both side should be equal.

${}_{55}^{137}Cs{⟶}_{56}^{137}Ba{+}_{-1}^{0}e$

m $137$ $137$

e $55$ $56-1=55$