Any help with this?

Doesn't make much sense to me.

Thank you!!

Complete the following nuclear decay series, providing either the type of decay (alpha or beta) on the arrow or the correct daughter atoms in the boxes.

Complete the following nuclear decay series, providing either the type of decay (alpha or beta) on the or the correct daughter atoms in the boxes. arrer Mass 252Cf 248 96 CM 240 NP (244 AM 95 244 Pu 94 +1 98 -2 93 It wat 228 AC 228Ra 236U 240 Pu 94 B 220 Rn 216Po 212 Pb B 212 Po 239 Pu A 231 Pa A B B B 207Pb