1. Bohr's Model of the Atom

2. Bohr’s Model Electron location is limited to energy levels
Gain energy to move to a higher energy level
lose energy to move to a lower energy level
How to determine the number of electrons: same number of protons

4. Bohr's Model of the Atom
fluorine:
#P =
#e- =
#N =

5. Bohr's Model of the Atom
fluorine:
#P = atomic #
= 9
#e- =
#N =

6. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = # P
= 9
#N =

7. Bohr's Model of the Atom
fluorine:
#P = 9
#e- = 9
#N = atomic mass - # P
= 10

8. Bohr's Model of the Atom
fluorine:
#P = 9
#e- = 9
#N = 10
draw the nucleus with
protons & neutrons 9P
10N

9. Bohr's Model of the Atom
fluorine:
#P = 9
#e- = 9
#N = 10
how many electrons can
fit in the first orbit? 9P
10N

10. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = 9
#N = 10
how many electrons are left? 9P
10N

11. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = 9
#N = 10
how many electrons are left? 7
how many electrons fit in the
second orbit? 9P
10N

12. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = 9
#N = 10
how many electrons are left? 7
how many electrons fit in the
second orbit? 8 9P
10N

13. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = 9
#N = 10 9P
10N

14. Bohr's Model of the Atom
try these:
hydrogen
boron
magnesium

15. Bohr's Model of the Atom
try these:
hydrogen 1P 0N

16. Bohr's Model of the Atom
try these:
boron 5P 6N

17. Bohr's Model of the Atom
try these:
magnesium
12P
12N

18. Activity
Draw the 3 different elements using Bohr’s model. Make sure you clearly represent protons, neutrons, and electrons.