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Make this table in your iSN. How did we figure out these very, very, small particles existed? As we go, 1) check the boxes that apply in your table 2) draw a diagram for each model. Atom Videos: Nanotechnology. How small are atoms? http://www.firecold.com/videos/the-real-size-of-an- atom.

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How did we figure out these very, very, small particles existed? As we go, 1) check the boxes that apply in your table2) draw a diagram for each model.



How small are atoms http www firecold com videos the real size of an atom
How small are atoms? existed? http://www.firecold.com/videos/the-real-size-of-an-atom

KEY POINTS

Atoms are so small it is difficult to imagine.

Atoms are mostly empty space. Drawings of the atom don’t show his because otherwise the nucleus would not be visible.

The nucleus is very dense!


Which is smaller, a cell or an atom? Also…they both have a nucleus?http://learn.genetics.utah.edu/content/begin/cells/scale/


Nucleus = the center nucleus?Nucleus of a cell contains DNA which contains atoms.Everything else in the cell is made of atoms.


The nucleus of an atom contains protons and neutrons an atom is 1 000 000 times smaller than a cell
The nucleus of an atom contains protons and neutrons nucleus?An atom is 1,000,000 times smaller than a cell!


Greek model
Greek Model nucleus?

  • Democritis- Greek philosopher

  • 400 BC

  • Idea of ‘atomos’ – at some point, matter cannot be further divided

  • Based on philosophy, not science



Dalton s theory 1803
Dalton nucleus?’s Theory- 1803

  • All elements are made of atoms. Atoms can’t be divided or destroyed.

  • Atoms of the same element are exactly alike.

  • Atoms of different elements are different.

  • Compounds are formed by the joining of atoms of two or more elements.


Thomson model 1897
Thomson nucleus?Model- 1897

  • PlumPuddingmodel.

  • Atoms were made from a positively chargedsubstance with negatively charged electrons scattered about, like raisins in a pudding.


Rutherford
Rutherford nucleus?

  • ****positively charged particles were contained in the nucleus.

  • negatively charged particles were scattered outside the nucleus around the atom’s edge.


Gold Foil Experiment nucleus?

http://www.youtube.com/watch?v=bSEOOMs5VNU

http://www.youtube.com/watch?v=hJs6PcgqMPA&feature=related


Bohr model 1913
Bohr nucleus?Model- 1913

  • The electrons move in energy levels

  • located at specificdistances from the nucleus.


1925 electron cloud model
1925- Electron Cloud Model nucleus?

  • it is impossible to determine the exact location of an electron, but we can estimate probabilities.

  • More complex than energy levels.

  • According to the modern atomic model, at atom has a small positively charged nucleus surrounded by a large cloud-like region of electrons



We have seen several atomic ‘models.’ nucleus?What is the scientific definition of a model?When would you use a model?Can we think of other examples of models?


The Electron Cloud model is the newest model. nucleus?1) Does that make it the ‘best.’2) Why is it useful to look at the other models?


Want to learn more
Want to learn more? nucleus?

Search terms for your investigation:

Democritus – Billiard ball model

John Dalton

JJ. Thomson – plum pudding model

Ernest Rutherford- Gold Foil Experiment

Inside of protons and neutrons- Quarks, Gluons

Details on experiments- Glencoe book pg62-74


How is an atom held together
How is an atom held together? nucleus?

http://learningcenter.nsta.org/lcms/default.aspx?a=so&gid=1162&tid=372&soid=72




In sum, the force holding the nucleus together is stronger than the repulsive force of the positively charged protons.


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