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Atom Model History. Where did it all begin?. What is an atom?. The smallest particle of an element that can keep the same properties of the element. What is the smallest number of carbon atoms that have all of the properties of carbon?. One. Democritus (Ancient Greece, 440 B.C.).

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atom model history

Atom Model History

Where did it all begin?

what is an atom
What is an atom?

The smallest particle of an element that can keep the same properties of the element.

What is the smallest number of carbon atoms

that have all of the properties of carbon?

One

democritus ancient greece 440 b c
Democritus(Ancient Greece, 440 B.C.)

He stated that atoms are the smallest particles of all matter.

Who was the first person to use the word atom?

Democritus

dalton 1803
Dalton(1803)
  • He proposed that atoms:
    • are the smallest part of matter.
    • cannot be created, divided, or destroyed.
    • of the same element are alike. (H = H)
    • of different elements are different. (H is not O.)
    • join to make new substances. (H + H + O = H20)

Did Dalton discover all five of these ideas?

No, he proposed (suggested) them.

thomson 1897
Thomson(1897)
  • Discovered electrons
  • “Plum Pudding” Model: atom is a lump of positively charged matter with electrons scattered throughout (like chocolate chip cookie dough.)

Did JJ Thompson discover protons?

No, he just suggested positive matter.

rutherford 1902
Rutherford(1902)
  • Discovered atoms have a nucleus (small, dense, positively-charged center)
  • Atoms are mostly empty space
  • Solar System Model

How is this model like a solar system?

It has objects (electrons) moving around a

central point (nucleus).

bohr 1913
Bohr (1913)
  • Said electrons move around the nucleus at certain speeds.

Did Mr. Bohr know that electrons moved? How?

Yes, because of Rutherford’s research.

schrodinger 1920 s
Schrodinger (1920’s)
  • Said electrons are in “clouds”

around the proton- and neutron-

filled nucleus.

  • Said the “clouds” have different amounts of energy.

What is Schrodinger’s first name?

Erwin

heisenburg 1927
Heisenburg1927
  • Said where the electron

clouds could exist in the

atom.

  • Argued a lot with Schrodinger..

Was Heisenburg a student of electrons?

Yes he was.

helpful websites
Helpful Websites
  • http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/page.htm
  • http://www.csmate.colostate.edu/cltw/cohortpages/viney/atomhistory.html
  • http://www.nobeliefs.com/atom.htm
lab outline
Lab Outline
  • http://www.integratelearning.org/Lesson%20Bank/AMcGinley/lp1pp1_files/frame.htm