Drawing Bohr Diagrams

Lesson 3

Bohr and Quantum Periodic TableLabel the s, p, d, and f orbitals.

1s

1s

F

1st Shell 2

2nd Shell 7

1. Draw the Bohr Diagram for the Element F

9 1-FFluorine19.0

Protons = 9

Atomic mass = 19

Neutrons = 19 - 9 = 10

7e-

2e-

9p10n

Why does F form an ion with a 1- charge?

7 valence electrons (outer)

Ca

1st Shell 2

3rd Shell 82nd Shell 8

4th 2

2882

2. Draw the Bohr Diagram for the Element Ca

20 2+CaCalcium40.1

Protons = 20

Atomic mass = 40

Neutrons = 40 - 20 = 20

Why does Ca form an ion with a 2+ charge?

2 valence electrons (outer)

8e-

8e-

2e-

20p20n

2e-

Kr

Look at all of the shells that are full before Kr

1st Shell 2

2nd Shell 8

3rd Shell 18 4th Shell 8

28188

3. Draw the Bohr Diagram for the Element Kr

36KrKrypton83.8

Protons = 36

Atomic mass = 84

Neutrons = 84 - 36 = 48

Does Kr form an ion?

8 valence electrons (outer)

18e-

8e-

2e-

36p48n

8e-

I-

Add 1 electron1 2

5 8

4 183 182 8

4. Draw the Bohr Diagram for the Element I-

53 1-IIodine126.9

Protons = 53

Atomic mass = 127

Neutrons = 127 - 53 = 74

Why does I form a 1- ion?

8 valence electrons

18e-

8e-

2e-

53p74n

18e-

8e-

Ag

1 2

5 2

4 173 182 8

Ba2+

Remove two electrons1 2

5 8

4 183 182 8

5. Draw the Bohr Diagram for the Element Ba2+

56 2+BaBarium137.3

Protons = 56

Atomic mass = 137

Neutrons = 137 - 56 = 81

Why does Ba form a 2+ ion?

8 valence electrons

18e-

8e-

2e-

56p81n

18e-

8e-