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.
Each energy level (shell) has more subshells available to it: 1  The first shell only has the s subshell â¹ 2 electrons. 2  The second shell has the s and p subshells â¹ 2 + 6 = 8 electrons. 3  The third shell has the s, p, and d subshells â¹ 2 + 6 + 10 = 18 electrons. 4  The fourth shell has the s, p, d, and f subshells â¹ 2 + 6 + 10 + 14 = 32 electrons.