Consumption of Energy & Intro into Atoms and Elements

Consumption of energy in the united states Commercial: 19% 2020 Residential: 22% Transportation 28% C Industrial: 31% Lecture 2 421 Intro to Atoms & Elements Leucippus and Democritus = Atomos NUCLEUS PROTON Atoms can not be divided NEUTRON ELECTRON J.J. Thompson, 1897 Discovery of the electron A very light negatively charged subatomic particle. In 1869, Dimitri Mendelcev discovered that if the known elements were arranged in order of atomic number The atom is composed of three subatomic Particies: - Protons carrying a charge unit of +1: 1.6726 x 10-249 - Neutron: carrying no charge 1.6749 x 10.249. - Electron: carrying a charge unit of -1.9.1 x 10289. Most albundant elements in Earth's crust: Element Mass Percent Oxygen 49.2 Hydroger Carbon Silicon 25.7 1 cloctron proton 6 protons Aluminum 7.50 6 cloctrong 6 reutrons Iron 471 Nitrogen Oxygen Calcium 3.39 7 neutrons 7 protons B protons 8 neutrons Most abundant elements in the human body Mass Percent Element Oxygen 65.0 *CHON:carbon, hydrogen, oxygen, Carbon 18.0 nitrogen. 5 organic atoms Hydrogen 10.0 Nitrogen 3.0 Calcium 1.4 What else is in your body? Trace elements such as: Cobalt Silicone Arsenic Flourine Nickel Copper Scientists have found that all matter can be broken down chemically into about one hundred different elements Presently 112 different+ elements are known 88 occur naturally Symbols of the Elements ↳ Rule: Generally, only the first letter is capitalized Simple elements: Fluorine F Exceptions: Oxygen O Zinc: Zn Carbon C Chlorine: Cl Silicon Si Platinum Pt Neon Ne Elements Original Latin or Greek names kallum: Potassium: K Gold Aurum: Au Sodium: Natrium: Na Hydragyrum: Mercury: Hg Iron Ferrum: Fe Argentium: Silver: Ag Cuprum: Copper Cu lead Plumbum: Pb Stannum: Tin: Sn Wolfram: Tungsten: W Other metals/elements Alkaline Metals: First column on periodic table except Hydrogen