Quantum Theory & Periodic Trends Worksheet 1. What element is represented by the electronic configuration 1s'2s'2p 3s'3p 2. What element is represented by the atomic orbital diagram 3s 3. Draw the atomic orbital diagram for: (a) Mn2 (b) Cu 4. Write the electron configuration for the following elements and ions without using the noble gas core (a) Cr (b) Si (c) Fe2 (d) p 5. Write the electron configuration for the following elements and ions without using the noble gas core: (a) Sn2 (b) Br