What is the chemical name for #"Na"_2"O"# ?
The first thing to notice here is that this compound contains a metal, sodium, and a nonmetal, oxygen, so right from the start, you know that you're dealing with an ionic compound.
Now, sodium is located in group 1 of the Periodic Table, which means that an atom of sodium has
Oxygen, on the other hand, is located in group 16 of the Periodic Table, which means that an atom of oxygen has
In order to name this compound, use the name of the cation first and the name of the anion last.
You will have
#"Na"_ 2"O" -> 2color(blue)(["Na"]^(+)) + color(red)(["O"]^(2-)) -> color(blue)("sodium") quad color(red)("oxide")#
Notice that the sodium cation carries a