AST 165 Lecture Notes - Lecture 8: Photosphere, Periodic Table
Document Summary
Temp: avg kinetic atom energy; how fast they move. Solar corona: outermost part of sun atmosphere; temp= 1 million k. Sun builds hydrogen into helium; converts 50 mill tons of hydrogen into 596 mill tons of helium. Sun releases energy by fusing 4 hydrogen atoms into 1 helium. Fission: break heavy atom into 2 lighter. Fusion: combine 2 light atoms into 1 heavy. Low speeds; elec mag. prevents protons from. High speeds; protons get close enough for strong force to bind them. Universe mostly hydrogen & helium; 2 lightest elements. Periodic table read left to right, up to down light stuff is at the top (lightest= hydrogen) Heavier stuff is at the bottom (heaviest= Atomic #: # of protons atom has; bottom # Always will be the same for each element. 3 parts of atom: proton, neutron, electron. Neutral elements: have same # of protons/neutrons. Mass #: total # of protons & neutrons; top #
