Ambigram : Chemistry

It's been a while since I submit my art(s)... was looking forward to seeing my ambigrams of the subjects I took in high school...

Rehashed this from my scrapbook, I drew this during my qualifying exam : chemistry, I finished the paper early and I still have around 15 minutes left, so I close the question paper and drew this (not exactly the same, I changed the E/S and I/M)...

Now I'm rehashing other ambigrams (other subjects I took)

so what do you think?