Question

what is the correct name for na₂o?
a. sodium dioxide
b. disodium oxide
c. sodium oxide
d. sodium(ii) oxide

Explanation:

Na is the chemical symbol for sodium. In ionic compounds like Na₂O, the metal (sodium) is named first, followed by the non - metal (oxygen) with the ending changed to - ide. The prefixes are not used for simple ionic compounds like this one where the metal has a fixed oxidation state (sodium always has a + 1 oxidation state in its common compounds). Sodium(II) is incorrect as sodium's common oxidation state is + 1.

Answer:

C. Sodium oxide