1. DRAWING BOHR MODELS

2. DRAW A BOHR MODEL OF NEUTRAL SODIUM ATOM
START OUT BY IDENTIFYING THE NUMBER OF PROTONS, ELECTRONS,& NEUTRONS “PEN”
FIND SODIUM ON THE PERIODIC TABLE TO GET INFORMATION
Atomic number
Atomic mass

3. REMEMBER IN A NEUTRAL ATOM … PROTONS = ELECTRONS
RECALL….. APE MAN to determine the “PEN”
Atomic Number Mass Number =
Protons Atomic Number
or =
Electrons Neutrons
_____ P
_____ E
_____ N 11 11 12
Mass Number– Atomic number = Neutrons
23 – 11 = 12

4. DRAW THE BOHR MODEL NOW USING THE “PEN” INFORMATION11 11
11 p
12 n 12
Place electrons on energy shells
1st level = 2 electrons
2nd level = 8 electrons
3rd level = 18 electrons

5. SO THERE IS 1 VALENCE ELECTRON!!! Now determine The number of
VALENCE ELECTRONS
VALENCE ELECTRONS ARE THE
ELECTRONS IN THE OUTER
ENERGY LEVEL.
SO THERE IS
1 VALENCE ELECTRON!!!