What is the volume occupied by 0.255 mol of helium gas at a pressure of 1.25 atm and a

Chapter 3 Tuesday, January 26, 2016 2:14 PM Lecture on 1/26/2016 Started with lots of conversions. SUPER IMPORTANT INFORMATION: Make sure when converting in metrics, the "1" in the equivalence statements goes with the unit with the PREFIX 3.1 Internal Structure of an Atom Subatomic particle: a very small particle that is a building block for atoms A. 3 types of subatomic particles a. Electron i. Subatomic particle with a negative electrical charge b. Proton i. Subatomic particle with a positive electrical charge c. Neutron i. Subatomic particle with no charge Nucleus: small, dense, and positively charged center of an atom. Contains protons and neutrons. Electron Cloud: the volume occupied by the electr