Let me tell you a little story. I was walking in New York City minding my own business, when all of a sudden a beautiful young woman bumped into me. In a frenzy she yelled: "What is the Periodic Elemental symbol for Rutherfordium?" "DO YOU KNOW THE SYMBOL FOR RUTHERFORDIUM?" Sadly I shook my head. She frowned and ran away. Had I known about this app, I would have remembered Rf is the symbol, and we would have started dating. The moral of this story. If you DO NOT download this app, you will be totally unprepared for random encounters involving esoteric Periodic Table Elements. I let a golden opportunity slip on by. I behoove you. Do not make the same mistake. Download this app!