Bohr Model The nucleus contains protons & neutrons

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Presentation transcript:

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

Electron Cloud Model Bohr 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]