help my nuclear, alpha, beta decay rxn?

Question

5. Complete the following nuclear reactions and name the decay process that is occurring in each:

a. 47Ca - > 47Sc + ?
b. 235U -> 4He + ?
c. ? -> 11B + 0-1e
d. 0-1e + ?-> 40Ar

Answer 1

c) I assume 0-1e means electron,mass number 0, charge -1

Since both charge and mass number must balance, ? in c must have mass number 11, charge one less than the charge on 11B. For an element,charge = atomic number = (for boron) 5. So ? is 11Be.; 4 = 5 + (-1)

d) very similar.

Easier if you write out both the mass number and the charge.

Answer 2

a. ===> e- Beta minus emission

b. ===> 231Th Alpha emission

c. Incomprehensible

d. Incomprehensible