Let's start with this super awesome video for teaching elements of the periodic table. My students LOVE this video. I print out the lyrics for the kids to follow along with. This video is great! The band, They Might Be Giants, does a great job writing other science songs and videos. It's a really catchy song that no one minds having stuck in their heads.
Now for cells...click on the picture to be taken to a website where students can interact with plant and animal cells. Each structure in the cell is explained and there are games for students to play as well.