The Atom

The Atom

1. Atom: The smallest part of an element which still has the properties of that element.

   • a.m.u:Atomic Mass Unit

2. The Atoms Contents

   • Protons: In the Nucleus Mass:1 a.m.u Charge:+1 (Positive charge)
   • Neutron: In the Nucleus Mass: 1 a.m.u Charge:0 (Neutral charge)
   • Electron: Outside of the Nucleus Mass: 1/1840 a.m.u Charge: -1 (Negative Charge)

3. Bohr Model: The Atom 1st Shell: up to 2 electrons 2nd Shell: u to 8 electrons 3rd Shell: up to 8 electron 4th Shell: up to 32 electrons

4. Atomic and Mass Number

   • Atomic Number:
   • Mass Number

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