What is the highest Z (p) when the N (n) is less than 30, and scandium is the element?
CREATE TABLE "complete_list_of_the_22_mononuclidic_ele" (
  "element" text,
  "nuclide" text,
  "z_p" real,
  "n_n" real,
  "isotopic_mass_u" text
);
SELECT AVG("z_p") FROM "complete_list_of_the_22_mononuclidic_ele" WHERE "n_n"<30 AND "element"='scandium';