Chemistry notes Energy levels and ions
Electron Energy Levels
- a region or level occupied by an electron
 first level: ____________________________________________
 second level: _________________________________________
 third level: ___________________________________________
Examples:
Q: How many electrons are in the outermost energy level of an atom?
(dot structures)
(continued)
Atoms try to obtain a filled outer energy level to become stable or nonreactive
 atoms become stable by Sharing or Transferring (taking/giving)
electrons from other atoms
Example
Compound:
Covalent Bond:
Molecule:
Ionic Bond:
Ions:
Chemistry notes (continued)
Making Ions
1) How many electrons are in the outer level
2) Complete an energy level by either giving or taking away electrons
3) Determine the charge (remember proton number, + charges do not
change)
4) Write the atomic symbol with the charge in the upper right of the
symbol
 Atoms that gain electrons become negatively charged
 Atoms that lose electrons become positively charged