Question

4.) the \2\ in li₂o represents that: (1 point) there are two oxygen atoms in lithium oxide there are two lithium atoms in lithium oxide there are two types of atoms in lithium oxide

Explanation:

In the chemical formula $\ce{Li_{2}O}$, the subscript "2" is associated with the element symbol $\ce{Li}$ (lithium). Subscripts in chemical formulas indicate the number of atoms of the preceding element in one formula unit of the compound. So the "2" means there are two lithium atoms in each formula unit of lithium oxide. The first option is incorrect because the subscript for oxygen is 1 (implied, not written), and the third option is incorrect as lithium oxide has two types of atoms (lithium and oxygen) regardless of the subscript "2".

Answer:

B. There are two lithium atoms in lithium oxide