Answer: hydrogen
Step-by-step explanation:
An element is a substance whose atoms have the same number of protons it’s not air because it is a mixture it is not water because it is a compound and carbon dioxide is a compound...
Hope this helped!!!!!!!
Answer:
Hydrogen is an element
Hydrogen is an element with only hydrogen atoms, whereas air, carbon dioxide, and water are all made up of multiple elements with different types of atoms.
5.8m questions
7.6m answers