Question

identify all of the items that represent an element and not a molecule. select all that apply.
li
cao
co₂
ne
h
n₂

Explanation:

An element is a pure substance that cannot be broken down into simpler substances. A molecule is formed when two or more atoms bond together.

• \(Li\) (lithium) is an element.
• \(CaO\) (calcium oxide) is a compound (molecule) made of calcium and oxygen atoms.
• \(CO_2\) (carbon dioxide) is a compound (molecule) made of carbon and oxygen atoms.
• \(Ne\) (neon) is an element.
• \(H\) (hydrogen, in atomic form here) can be considered as representing the element (though hydrogen gas is \(H_2\), but the question seems to take \(H\) as the element symbol).
• \(N_2\) is a molecule (diatomic molecule of the element nitrogen).

Answer:

Li, Ne, H