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.
We will not fill in more than 20 electrons so donât worry about what comes next after 4s. Remember for neutral atoms, the number of protons equals the number of electrons. So for each atom note how many electrons you have and fill them in! Remember s sublevels can only hold 2 electrons, and p 6 electrons.