BIOL 101 Lecture Notes - Cellulose Fiber, Sodium Bicarbonate, Blood Sugar
Document Summary
Atoms cannot be subdivided any further without losing its essential properties. Forces of attraction between positive and negative charges hold the fast-moving electrons close to the nucleus. Elements cannot be broken down chemically into any other substances. 25 elements found in you body and the big four. Everything around us, living, or not, is made from atoms, the smallest unit into which material can be divided. Chemical characteristics of an atom depend upon the number of electrons in its outermost shells, the no. of p+, the no. of n0, and the no. of e- 2. 3: atoms can bond together to form molecules or cpds. Hydrogen bonds: are formed between the slightly positively charged hydrogen atoms of one water molecule and the slightly negatively charged atoms of another. Covalent bonds: strong bonds formed when two atoms share e- 2. 4: a molecule"s shape gives it unique characteristics. 2. 6: water has unusual properties that make it critical to life.
