Electron Configurations

1. Please indicate which period you have chemistry. 2nd 4th 7th 2. Electron Configuration Write the electron configuration for the following.Use the symbol ^ to indicate exponent. Use one space after each orbital.For example, 1s^2 2s^2 Element Electron Configuration Oxygen (O) 1s^2 2s^2 2p^4 Magnesium (Mg) 1s^2 2s^2 2p^6 3s^2 Chromium (Cr) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^4 3. Explain briefly why each of the following scenarios are incorrect. a) The electron configuration for fluorine is 1s22s22p6. b) c) 4. Draw Lewis Diagrams for strontium and arsenic. (You can draw it on paper, take a picture, and upload it here.)