Question

Which pure substance can be classified as an element? -H2 -NO3 -NaCl -H2SO4

Answer 1

H₂ can be classified as an element.

Step-by-step explanation:

An element is defined as a substance with only one kind of atom.

H₂ is a substance that only has one kind of atom: hydrogen.

NO₃ is a substance that has two kind of atoms: nitrogen and oxygen.

NaCl is a substance that also has two kind of atoms: sodium and chlorine.

H₂SO₄ is a substance that has three kind of atoms: hydrogen, sulphur and oxygen.

Thus, H₂ can be classified as an element.

I hope it helps!

Answer 2

The answer is :

H2

because a compound is made up of 2 or more elements.

Step-by-step explanation:

An element is a substance that is made uniquely from one type of atom. For example, the element hydrogen is produced from atoms comprising a single proton and a single electron. If you change the number of protons an atom has, you develop the type of element it is.