Ch. 2C- Lesson 1, pp. C40-C45
Terms
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- John Daltons theory was; All _______ is made up of tiny _______ called ________.
- matter, particles, atoms
- Atoms have a _____ in the center made up of three differnet ________ particles.
- nuclues, subatomic
- A submatomic particle with a postive charge found in the Nuclues.
- A proton
- A submatomic particle with no charge found in the nuclues.
- Nuetron
- a submatomic particle with a negative charge: Surronds the nuclues
- electron
- electrons circle the nuclues in a fixed orbit. Low energy electrons were thought to orbit close to the nucleus, and high energy electrons orbited further away from the nucleus.
- The Bohr Model
- electrons may occupy many positions around the nucleus in a spherical orbit.
- The Modern model
- Most of the mass of an atom is found in the
- nucleus
- Protons and neutrons have
- about the same mass
- Protons have ____ more mass than electrons.
- 2,000 tomes
- Protons and electrons have different masses but they
- have strong charges
- The atThe attraction betweenpostive protons and negative electrons is
- what holds the atoms together
- Positive charges have
- more protons
- Negative Charge
- more electrons
- Nuetral charge
- Equal number of protons and electrons