Answer:
Option A. ⁰₋₁β
Step-by-step explanation:
Let the unknown be ʸₓA
Thus, the equation given becomes:
⁹⁸₄₃Tc —> ⁹⁸₄₄Ru + ʸₓA
Next, we shall determine the value of x, y and A in order to obtain the answer to the question. This can be obtained as follow:
43 = 44 + x
Collect like terms
43 – 44 =
–1 = x
x = –1
98 = 98 + y
Collect like terms
98 – 98 = y
0 = y
y = 0
ʸₓA => ⁰₋₁A => ⁰₋₁β
Thus, the complete equation is
⁹⁸₄₃Tc —> ⁹⁸₄₄Ru + ⁰₋₁β
The missing item is ⁰₋₁β