History of atomic structure
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History of Atomic Structure. How long have people been interested in understanding matter and its structure? Thousands of years Hundreds of years A few years Never. Ancient Philosophy. Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece

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How long have people been interested in understanding matter and its structure?

  • Thousands of years

  • Hundreds of years

  • A few years

  • Never

Ancient philosophy
Ancient Philosophy matter and its structure?

  • Who:Aristotle, Democritus

  • When: More than 2000 years ago

  • Where: Greece

  • What: Aristotle believed in 4 elements: Earth, Air, Fire, and Water. Democritus believed that matter was made of small particles he named “atoms”.

  • Why: Aristotle and Democritus used observation and reasoning to explain the existence of everything.

Democritus matter and its structure?


Alchemists matter and its structure?

  • Who: Early “Scientists”

  • When: 500 – 900 years ago

  • Where: Europe, Asia and Middle East

  • What: Their work developed into what is now modern chemistry.

  • Why: Trying to change ordinary materials into gold.

Alchemic Symbols matter and its structure?

Particle theory
Particle Theory matter and its structure?

  • Who:John Dalton

  • When: 1808

  • Where: England

  • What: Described atoms as tiny particles that could not be divided. Thought each element was made of its own kind of atom.

  • Why: Building on the ideas of Democritus in ancient Greece.

John Dalton matter and its structure?

Discovery of electrons
Discovery of electrons matter and its structure?

  • Who:J. J. Thompson

  • When: 1897

  • Where: England

  • What: Thompson discovered that electrons were smaller particles of an atom and were negatively charged. ‘Plum pudding’ model.

  • Why:Thompson knew atoms were neutrally charged, but couldn’t find the positive particle.

J. J. Thompson matter and its structure?

Solar system model
‘Solar system’ model matter and its structure?

  • Who: Ernest Rutherford

  • When: 1911

  • Where: England

  • What: Conducted an experiment to isolate the positive particles in an atom. Decided that the atoms were mostly empty space, but had a dense central core.

  • Why: He knew that atoms had positive and negative particles, but could not decide how they were arranged.

Ernest Rutherford – born in NZ matter and its structure?

Orbits model
Orbits model matter and its structure?

  • Who: Niels Bohr

  • When: 1913

  • Where: England

  • What: Proposed that electrons traveled in fixed paths around the nucleus. Scientists still use the Bohr model to show the number of electrons in each orbit around the nucleus.

  • Why: Bohr was trying to show why the negative electrons were not sucked into the nucleus of the atom.

Bohr’s Model matter and its structure?

Niels Bohr

Electron cloud model
Electron cloud model matter and its structure?

  • Electrons travel around the nucleus in random orbits.

  • Scientists cannot predict where they will be at any given moment.

  • Electrons travel so fast, they appear to form a “cloud” around the nucleus.

Electron cloud model matter and its structure?

What is the latest
What is the latest? matter and its structure?

  • Scientists have discovered many new smaller parts of an atom.

  • Find out more!!!!!

Atomic structure timeline
Atomic Structure Timeline matter and its structure?


  • Must include a title.

  • Must include a spot for each of the 7 items.

  • Must include at least the Who, When, and What.

  • Must have a picture for each item – see atomic model pdf atomic model resource


  • Flow Map format

  • Standard timeline