Question

Which substance is an element that is composed of molecules?(1 point)
Responses

hydrogen (H2)
hydrogen (H 2 )

helium (He)
helium (He)

methane (CH4)
methane (CH 4 )

water (H2O)

Answers

GPT-4o mini
The substance that is an element composed of molecules is **hydrogen (H₂)**.

Hydrogen is a diatomic molecule, meaning it exists as pairs of hydrogen atoms (H₂) when it is in molecular form. The other options listed (helium, methane, and water) do not fit the description of an element. Helium is a noble gas and exists as individual atoms, while methane and water are compounds made up of different elements.