The Allegory of the Cave. The dialogue between Socrates and Glaucon is probably fictitious and composed by Plato; whether or not the allegory originated with Socrates, or if Plato is using his mentor as a stand-in for his own idea, is unclear. In the dialogue, Socrates asks Glaucon to imagine a cave, in which prisoners are kept.
The d sublevel consists of five orbitals that can hold a maximum of  two electrons each. The total maximum number of electrons that the  d sublevel can hold is 10 electrons.
Since a p subshell can hold 6 electrons, one of the fluorine electrons is unpaired. An unpaired electron acts like a little magnet. So fluorine, because of its unpaired electron, is weakly attracted into a magnetic field, and is said to be paramagnetic. All of calcium's electrons are in filled subshells.It has no unpaired elecectrons and is, therefore, not attracted to a magnetic field. It is said to be diamagnetic. This is vastly simplified, of course.ince a p subshell can hold 6 electrons, one of the fluorine electrons is unpaired. An unpaired electron acts like a little magnet. So fluorine, because of its unpaired electron, is weakly attracted into a magnetic field, and is said to be paramagnetic. All of calcium's electrons are in filled subshells.