If you were to classify a newly discovered animal, what would you want to know first? Does it live on land or in the sea?
Does it have a backbone?
Does it have hair?
Does it have vascular tissue?

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?