Atomic Theory

Atomic Theory

1. charges

   • proton +1
     • found in nucleus
   • neutron 0
     • found in nucleus
   • electron -1
     • found in shells

2. numbers

   • atomic number
     • Amount of protons in the nucleus
   • mass number
     • Amount of protons an neutrons in the nucleus

3. isotopes

   • Atoms with the same number of protons, different number of neutrons

4. ions

   • A charged particle formed by the loss or gain of electrons

5. plum pudding vs today

   • plum pudding postively charged proton with electrons embedded. No neutrons
   • protons and neutrons in the nucleus, electrons orbit in shells

6. Electron configuration

   • The way the electrons are arranged in their shells surrounding the nucleus
     • calcium- 2,8,8,1
   • group number
     • number of outer electrons
   • period number
     • number of electron shells