[BI SC 004] - Final Exam Guide - Ultimate 94 pages long Study Guide!
Document Summary
Life on earth is made of chemical elements: all objects in the universe are made up of matter, matter consists of one or more elements, approximately, 25 elements are essential to life, you are what you eat. Subatomic particles of atoms: neutrons, neutral (uncharged, protons, positively charged, neutrons and protons make up the nucleus, electrons, negatively charged, orbit around the nucleus, hydrogen, electron, proton, oxygen, electrons, protons, neutrons. Molecules: made of atoms that are bonded together, can be made of, the same atom, different atoms, atoms that form molecules can form bonds in different ways. Ionic bonds: atoms in this type of bond either, donate electrons, accept electrons, results in a stable outer valence shell, occur between particles that are charged. Ions: examples, sodium atom, chlorine atom, together they make sodium chloride. Covalent bonds: atoms in this type of bond share electrons, result in a stable outer valence shell, much stronger bond than ionic bond.
