Question

part a
which elements have molecules as their basic units?
check all that apply.
helium
iron
bromine
oxygen
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Explanation:

• Helium (\(He\)) is a noble gas and exists as single - atom particles (monatomic), not molecules.
• Iron (\(Fe\)) is a metal and has a metallic lattice structure with metal ions and delocalized electrons, not molecules.
• Bromine (\(Br_2\)) is a diatomic molecule.
• Oxygen (\(O_2\)) is a diatomic molecule.

Answer:

C. bromine, D. oxygen