Atoms

Atoms

1. STRUCTURE

   • NUCLEUS
     • Protons
     • Neutrons
     • Positive charge overall because the PROTONS are positively charged and the neutrons have no charge
     • Small compared to the atom as a whole
   • SHELLS
     • Electrons
       • Move around the nucleus
       • Negative charge because electrons have a negative charge
   • Positive and negative attract so that's why the electrons don't just fly away from the nucleus
   • Number of PROTONS = Number of ELECTRONS because they have the same charge just opposite.

2. PROTONS = 1 relative mass AND +1 relative charge

3. NEUTRONS = 1 relative mass AND 0 relative charge

4. ELECTRONS = 1/2000 relative mass AND -1 relative charge

5. ELECTRON SHELLS

   • 1st shell holds 2 ELECTRONS 2nd shell holds 8 ELECTRONS 3rd shell holds 8 ELECTRONS
   • ELECTRONIC CONFIGURATION
     • Basically a list of how many electrons are in each shell.
       • Nitrogen's = 2,5
       • Argon's = 2,8,8