Consider the following question: Why are there free electrons in a metal?
The answer suggests that conductors have free electrons because the atoms have a weak attraction on the electrons in the outer shell:
Compared to the s and p orbitals at a particular energy level, electrons in the d shell are in a relatively high energy state, and by that token they have a relatively "loose" connection with their parent atom; it doesn't take much additional energy for these electrons to be ejected from one atom and go zooming through the material,
Conversely, I'm assuming insulators have strong connections with the outer shell electrons. Since insulator atoms "want" electrons and conducting atoms "don't" why aren't all conductors charged since there always in contact with air (an insulator)?
If the insulator atoms want electrons and the conductor atoms don't, why doesn't the insulator pull the electrons away from the conductor? Why doesn't air pull the electrons away from conductors?
Please answer in layman's terms without using concepts that a high school freshman wouldn't understand.