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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
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]