Determine the type of bonding is formed between sodium and oxygen?
An ionic bond is formed
An ionic bond is formed because sodium is a part of the Alkali metals and Oxygen is a non-metal and a gas.
Remember: Metal + Non-Metal = Ionic Bond
Therefore the bond between Sodium and Oxygen is an ionic bond since a Metal is bonded chemically with a Non-Metal
4Na + O2 → 2Na2O (s) OR Na + O2 → NaO2 (s).