PHYL 141 Lecture Notes - Lecture 2: Chemical Formula, Atomic Number, Hexose
6 Jun 2021
School
Department
Course
Professor
Document Summary
Chemical elements: matter exists in 3 forms: solid, liquid & gas, all forms of matter composed of chemical elements. Iron (fe) ionized form (fe2+ and fe3+) part of hemoglobin (oxygen-carrying protein in. Rbcs) & some enzymes (~0. 005% body mass: trace elements contribute ~0. 4% body mass(14 elements) Includes: albumin (al), boron (b), chromium (cr), cobalt (co), copper (cu), fluorine (f), Iodine (i), manganese (mn), molybdenum (mo), selenium (se), silicon (si), tin (sn), Atoms smallest units of matter that retain properties & characteristics of the element. Atomic number - # of protons in nucleus of an atom. Electron shells each shell holds specific number of electron (1st shell = no more than 2 electrons, 2nd shell = maximum of 8 electrons, 3rd shell up to 18 electrons) Valence shell outermost shell (wants even # electrons: measured in daltons or atomic mass unit (amu, atomic mass (atomic weight) average mass of all its naturally occurring isotopes.
