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Journey Inside the Atom

The big picture

Each new model answered a result the last could not.

Journey Inside the Atom, one line for each idea
IdeaRemember
The piece has partsCathode rays are electrons. Every atom has them.
Something with a chargeElectron −1, proton +1. An atom is neutral.
Where the mass sitsA tiny, dense nucleus. Most of an atom is empty space.
A picture that had to changeDalton, then Thomson, then Rutherford, then Bohr.
ShellsK, L, M hold 2, 8, 18. The outermost shell holds at most 8.
Which atom is itZ = protons. A = protons + neutrons.
Filling the shellsK takes 2. L takes 8. M takes only 8 in the first 18 elements. The outermost shell holds at most 8.
The outer shell decidesGenerally, fewer than 4 outer electrons: lose. More than 4: gain. Exactly 4: share.

Now open Chapter 8, Journey Inside the Atom, in your book. Try its questions with these ideas.

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This track

  1. 0 Start here
  2. 1 The piece has parts
  3. 2 Something with a charge
  4. 3 Where the mass sits
  5. 4 A picture that had to change
  6. 5 Shells
  7. 6 Which atom is it
  8. 7 Filling the shells
  9. 8 The outer shell decides
  10. 9 The big picture
  11. 10 Track quiz

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