CHEM 105bL Chapter Notes -Subatomic Particle, Electron Rest Mass, Atomic Mass
Document Summary
Neutrons- subatomic particle with no charge; similar mass as proton. Charge- can be neutral (same electrons as protons), negative, or positive. Mass number- sum of protons and neutrons (assuming they are each 1 amu) In nature, mass number is not a whole number due to interactions within the atom and the miniscule electron mass. What makes up mass of element- protons and neutrons. Atom- smallest known particle containing protons, electrons, and neutrons which makes the atom unique. Element- made up of the same type of atom and has unique properties defined by the number of protons they have. Isotope- atoms of the same element (protons) with different masses (neutrons) Periodic table- lists atomic symbol for elements of protons in ascending order. Nonmetals are in upper right; all others are metals. Ions- created when electrons move from one atom to another. When they have a charge, they are an ion. Cation- overall positive charge (more protons than electrons)
