Simulation: Atomic Structure (Principles): Atoms and... mory. Closing it may improve the responsiveness of your Mac. Download Firer 20 I 110 DAY 1 08:23 PROGRESS: 25 THEORY MEDIA Create an atom with mass number 3 and neutral charge. Click the red E when done. MISSION Position as many neutrons and protons required in the nucleus and as many electrons on the orbitals to create the required atom. % 5 * 8 BA yAtom DAY 1 08:37 PROGRESS: 25% + Create an atom with mass number equal to 3 and neutral charge. Click the red button when done.