We watched a video about Marie & Pierre Curie's groundbreaking work in the early 20th century. This link takes you to the video series it was a part of. The section on the Curies is in video #2 the second half.
Links:
Worksheet packet for Nuclear
Answer key for Nuclear Worksheet Packet.
Answer key for Regents Question pack.
The next unit is Organic Chemistry. This is the packet for notes that I passed out in class.