Yes, \(Na_2Cr_2O_7\) is an ionic compound containing the polyatomic ion \(Cr_2O_7^{2-}\). The sodium ions (Na+) are positively charged, while the dichromate ions (Cr2O72-) are negatively charged. The electrostatic attraction between these ions holds the compound together.

The dichromate ion is an oxyanion, which means that it contains oxygen and a central metal atom (in this case, chromium). The chromium atom in the dichromate ion is in the +6 oxidation state. The two chromium atoms in the ion are bonded to each other by a double bond, and each chromium atom is also bonded to four oxygen atoms. The overall shape of the dichromate ion is a distorted octahedron.