TEST BANK For Microbiology for the Healthcare Professional, 3rd Edition

TEST BANK For Microbiology for the Healthcare Professional, 3rd Edition Matter - Anything that takes up space and has mass Elements - cannot be broken down further by natural forces Chemical Compounds - Elements in combination Chemical Expression - Shorthand expression of a chemical compound Atoms - Smallest particles of an element Atomic Nucleus - consist of protons and neutrons - Located in the center of the cell - Protons are positively charged - Neutrons have no charge Atomic weight (atomic mass) - the number of protons and neutrons (The sum) Orbital/ Shell - a volume of space around the nucleus containing electrons - further from the nucleus, the more energy - Number of shells depend on the atomic number - First shell has two electrons - Second shell can hold up to 8 - Atom is most stable when outermost shell is filled Chemical Bond - a chemical reaction - If the outermost shell is not complete, the atom can participate in bonding Valence electrons - The electrons in the outermost shell - Can participate in Chemical reactions - If outermost shell is complete the atom is stable(Inert