Why does the s orbital fill before the p orbitals

Electrons fill low energy orbitals

Explanation:

before they fill higher energy ones. Notice that the s orbital always has a slightly lower energy than the p orbitals at the same energy level, so the s orbital always fills with electrons before the corresponding p orbitals do.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.