Hello ellie again. I am still having trouble understanding bombardment. The question I'm working on says Complete the bombardment reaction ? + 40-18Ar → 43-19K + 1-1H
All you need to do is add the numbers. You can avoid confusion if you let the first number stand for atomic number and the secondone (on the right) stand for mass number.
yXz + 18Ar40 ==> 19K43 + 1H1
y + 18 = 19 + 1 so y must be 2
Element 2 is He
z + 40 = 43 + 1 so z must be 4
2He4 + 18Ar40 ==> 19K43 + 1H1