skeletal system

Feb 3rd, 2012
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This is a PowerPoint on the skeletal system. It is interactive and teaches students about the system and how it work in your body. It is great to use as a review.

Word Count: 287
Showing Page: 1/7
Models Of The AtomJohn Dalton(1803)J.J. Thomson(1897)ErnestRutherford(1906)Niels Bohr(1913)Electron Cloud(Current)TheFutureCopyright 2011 InteractiveScienceLessons.comMatter is made of atoms toosmall to be seen.Each type of matter is made ofone kind of atom.All the atoms of one kind ofmatter are exactly alike.John Dalton(1803)Dalton picturedatoms as a hardsphereCopyright 2011 InteractiveScienceLessons.comJ.J. Thomson(1897)ExperimentParticles bent towards + end of amagnetThat means thatThey have a chargeAnd that charge is negativeAtoms must be made of evensmaller particlesThese turned out to be electronsThomson picturednegatively chargedparticles embeddedin a positivelycharged ball(chocolate chipcookie/plumpudding).Copyright 2011 InteractiveScienceLessons.comExperimentFired positively-charged particlesat a piece of gold foil.Most of them passed rightthrough. A few did not.That meant thatAtoms are mostly empty spaceExcept for something thatsvery hardAnd positively chargedErnestRutherford(1906)He pictured anatom of mostlyempty space wherenegatively chargedparticles movearound a smallpositively chargedsphere.Copyright 2011 InteractiveScienceLessons.comCame across evidence thatsuggested electrons are in energylevels.Niels Bohr(1913)He picturedelectrons orbitingthe nucleus i

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