Here’s your chance to pretend you’re some sort of scientist by playing around with molecules. If anyone asks what you’re doing, just tell them it’s research.
The point of Atomic Puzzle 2 is to eliminate all the atoms by removing just a few with your mouse. Atoms of the same colour, with another atom in the middle, are the key to this game. Remove that middle atom, and the other two will vanish. But do it in the wrong order, and you’ll be left with some spare at the end.
Have fun, and remember… research ;)