What is the isotopic mass (u) when the nuclide is 89 y?
CREATE TABLE "complete_list_of_the_22_mononuclidic_ele" (
  "element" text,
  "nuclide" text,
  "z_p" real,
  "n_n" real,
  "isotopic_mass_u" text
);
SELECT "isotopic_mass_u" FROM "complete_list_of_the_22_mononuclidic_ele" WHERE "nuclide"='89 y';