Answer:
Option 4: ¹⁴₆C —> ⁰₋₁e + ¹⁴₇N
Explanation:
To know which option is correct, do the following:
Option 1:
²²¹₈₇Fr —> ⁴₂He + ²²⁵₈₅At
87 = 2 + 85
87 = 87
221 = 4 + 225
221 ≠ 229
Thus the equation is not balanced.
Option 2:
²³⁷₉₃Np —> ⁴₂He + ²³³₉₅Am
93 = 2 + 95
93 ≠ 97
237 = 4 + 233
237 = 237
Thus, the equation is not balanced.
Option 3:
²¹⁴₈₂Pb —> ⁰₋₁e + ²¹⁴₈₁Tl
82 = –1 + 81
82 ≠ 80
214 = 0 + 214
214 = 214
Thus, the equation is not balanced.
Option 4:
¹⁴₆C —> ⁰₋₁e + ¹⁴₇N
6 = –1 + 7
6 = 6
14 = 0 + 14
14 = 14
Thus, the equation is balanced.
From the illustrations above, only option 4 is correct.
