Electron Shell: This is like a layer of an onion, where each shell can hold a certain number of electrons. The outermost shell is where you'll find the valence electrons.
Covalent Bond: This is when two atoms share their valence electrons, kind of like how best friends might share their favorite toys.
Ionization Energy: This is the energy required to remove a valence electron from an atom. It's like how much effort it would take for someone to pry your favorite toy out of your hands!