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Bohr Model • The nucleus contains protons & neutrons • Electrons orbit in the space around the nucleus. • “Planets around the sun” Bohr Model • This restricts electrons to certain orbits and cannot effectively model all the elements [http://www.incompetech.com/gallimaufry/signs/bohr.gif] Electron Cloud Model • Electrons move somewhat randomly in the space around the nucleus. [http://web.buddyproject.org/web017/web017/images/atom.JPG] Electron Cloud Model • “Clouds” are shaded to show where electrons are more likely to be found Bohr Model Electron Cloud Model Sub-Atomic Particles • Protons • Given by the atomic number of an element. • + 1 Charge • Actual mass = 1.67x10-24 g • Atomic mass = 1 amu [http://imagine.gsfc.nasa.gov/Images/try_this/helium.gif] Sub-Atomic Particles • Neutrons • Atomic mass minus Atomic number equals the # of neutrons • No charge • Actual mass = 1.67x10-24 g • Atomic mass = 1 amu [http://imagine.gsfc.nasa.gov/Images/try_this/helium.gif] Sub-Atomic Particles • Electrons • Same number as the protons when neutral! • -1 charge • Actual mass = 9.11x10-28 g • Atomic Mass = 0 amu Table on Pg. 104 [http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/TB02_01.JPG]
