What is the name of #K_2CrO_4#?
This is a bright yellow salt, that is sometimes used to oxidize organic species. The transition metal oxidation state is (of course)
You're dealing with an ionic compound, so right from the start you know that you should identify the cation, which is the positively charged ion, and the anion, which is the negatively charged ion.
You should be able to recognize the fact that the compound contains potassium,
The anion is actually a polyatomic ion made up of one chromium atom,
To write the name of this compound, start with the cation, which is the potassium cation, and end with the anion, which is the chromate anion. You will thus have
#"K"_2"CrO"_4 ->#potassium chromate
Potassium chromate is yellow in color, both is solid form
and in aqueous solution