Knock-knock. Who's there? To. To who? No, to whom.
 369
0  

Two chemists go into a restaurant. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" - and he died.
 957
0  

Q: What do you do with a sick chemist? A: If you can't helium, and you can't curium, then you might as well barium.
 952
0  

Helium walks into a bar. The bartender says "We don't serve noble gasses in here." Helium doesn't react.
 2158
1  

A biologist, a chemist and a statistician are out hunting. The biologist shoots at a deer and misses 5th to the left. The chemist takes a shot and misses 5th to the right. The statistician yells "We got 'em!"
 1425
0