CO isn’t a compound so it’s D
Answer:
Element
Explanation:
An element is substance that is composed of only one kind of atom and can not be separated into simpler substances or converted into another substance by chemical processes.
Chemical elements are found in the periodic table. Examples of chemical elements include; sodium potassium, phosphorus, hydrogen etc.
Answer is potassium and sodium. They are in the same group and that means they have the same properties. They are all alkali metals
