Originally Posted by ED9man

Or do I need to focus in class more h:

I noticed that Rubidium, Rb, and Strontium, Sr, are right next to the other.
And then I thought about the Nissan engine series that begin with those two letters. I wonder if Nissan engineers looked at a periodic table and named the engines after those elements. The next one is Y, is there a Y engine series?

BTW 6.02 x 10^23 atoms equals one mole