1. Bohr's Model of the Atom

2. Bohr's Model of the Atom
Niels Bohr (1913):

3. Bohr's Model of the Atom
Niels Bohr (1913):
-studied the light produced when atoms were excited by heat or electricity

4. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun

5. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons

6. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons
orbit
maximum # electrons 1 2 8 3 4 18

7. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons
-electrons fill orbits closest to the nucleus first.

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

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

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

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

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

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

14. Bohr's Model of the Atom
e.g. fluorine:
#P = 9
#e- = 9
#N = 10
how many electrons can
fit in the first orbit? 2 9P
10N

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

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

17. 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

18. 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

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

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

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

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

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