Technetium(VII) oxide is the

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

with the

formula In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a ''chemical formula''. The informal use of the term ''formula'' in science refers to the general construct of a relationship betwe ...

Tc₂O₇. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being RuO₄, OsO₄, and the unstable Mn₂O₇. It adopts a centrosymmetric corner-shared bi-tetrahedral structure in which the terminal and bridging Tc−O bonds are 167pm and 184 pm respectively and the Tc−O−Tc angle is 180°. Technetium(VII) oxide is prepared by the oxidation of

technetium Technetium is a chemical element; it has Symbol (chemistry), symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium and promethium are the only radioactive elements whose neighbours in the sense ...

at 450–500 °C: :4 Tc + 7 O₂ → 2 Tc₂O₇ It is the anhydride of pertechnetic acid and the precursor to sodium pertechnetate: :Tc₂O₇ + 2 H₂O → 2 HTcO₄ :Tc₂O₇ + 2 NaOH → 2 NaTcO₄ + H₂O

References

{{Oxides Technetium compounds Transition metal oxides Acidic oxides