Question

Which is an element hydrogen , air , carbon dioxide , water​

Answer 1

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...

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Answer 2

Hydrogen is an element

Step-by-step explanation:

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.