Activity 5: Group the Period Directions: Based on the electronic configuration, identify the period number, group number, number of paired electrons, number of unpaired electrons of the following elements. Period Group Number Number of Electron Configuration Number Number of paired unpaired electrons electrons 1. 11 Na - 1s22s22p 3s 2. 35Br - 1s 2s 2p3s 3p4s23d104p 3. 18Ar - 1s 2s22p63s23p 4. SB - 1s22s22p 5. 20Ca - 1s 2s22p%3s 3p6482​