Orbitals in Energy Levels 1-4 (Dr. Amah) ______Shell Orbitals Maximum Shell Number Capacity Of Electrons ______

1 1s 2 2

2 2s 2 8

2p, 2p, 2p 6

3 3s 2 18

3p, 3p, 3p 6 3d, 3d, 3d, 3d, 3d 10

4 4s 2 32

4p, 4p, 4p 6

4d, 4d, 4d, 4d, 4d 10

4f,4f, 4f, 4f, 4f, 4f, 4f 14

Problems 1. Identify the elements that have the following electron shell arrangements: Energy Level: 1 2 3

a. 2e- 1e- b. 2e- 8e- 2e- c. 1e- d. 2e- 8e- 8e- e. 2e- 8e- 3e-

2. The elements boron and aluminum are in the same group on the periodic table.

a. Write the electron arrangement for boron and aluminum

b. How many electrons are in the outer energy levels for each element?

c. What is their group number?