Electronic Configurations Of Elements And The Periodic Table

The atomic number of 19 corresponds to the element Potassium (K). The electron configuration of potassium is: Thus, the M shell (third shell) contains 8 electrons.

Nitrogen (N) is paramagnetic because it has unpaired electrons in its molecular orbital configuration. The other atoms listed have all paired electrons, making them diamagnetic. Thus, the correct answer is Nitrogen.