The element corresponding to the higher oxide of the composition R2O7 has the electronic configuration

The element corresponding to the higher oxide of the composition R2O7 has the electronic configuration of the external level: 1) ns2np3 2) ns2np5 3) ns2np1 4) ns2np2

In the higher oxide, the element exhibits the highest possible oxidation state. At the same time, the number of the group in which the element is located is determined by the number of electrons on the outer shell of the atom (valence electrons) and basically corresponds to the highest oxidation state of the atom.

In oxide R2O7, the element R has an oxidation state of + 7, which means that the element is in group 7 and there were 7 electrons at the outer level (2 at s and 5 at the p sublevel). Element R has an ns2np5 external level electronic configuration.