Column A
1.
W:
W
2.
X:
X
3.
Y:
Y
4.
Z:
Z
Column B
a.Electron
b.Proton
c.Nucleus
d.Neutron
Column A Column B
1. W: a. Electron
2. X: b. Proton
3. Y: c. Nucleus
4. Z: d. Neutron
It's not clear what exactly you are asking for, but it seems like you are looking for the corresponding elements in Column B for each entry in Column A. Here is the matching:
1. W: c. Nucleus
2. X: b. Proton
3. Y: a. Electron
4. Z: d. Neutron
If you have a specific question or need further assistance, please let me know.