BIOL 203 Lecture Notes - Lecture 5: Covalent Bond, Electronegativity, Chlorine
Document Summary
Lecture #2 - review of chemistry i: describe the properties of subatomic elements, elements, and compounds. Subatomic elements: protons +(atomic #), neutrons, and electrons - (also atomic #) Elements: substances that cannot be broken down to other substances by chemical reactions. Compounds: substance consisting of two or more elements in a fixed ratio (ex: nacl: how can a radioactive isotope be utilized in biological research. Dating fossils, tracing atoms through metabolic processes, diagnosing medical disorders: what determines the chemical behavior of an atom. The chemical behavior is determined by the valence: # of electrons in the outermost shell: identify the naturally occurring elements in the human body. Oxygen, carbon, hydrogen, nitrogen, calcium, phosphorus, potassium, sulfur, sodium, **trace elements: b, cr, co, cu, f, i, fe, mn, mo, se, sn, v, zn: what kind of bond occurs when a pair of valence electrons are shared by two atoms.
