Table: mononuclide_data
Columns: element
nuclide
z_p
n_n
isotopic_mass_u

Question: What is the mass of the element with a nuclide that is 169 tm?
SQL: SELECT "isotopic_mass_u" FROM mononuclide_data WHERE "nuclide" = '169 Tm'

Question: What is the total number of N for the element with nuclide of 141 pr?
SQL: SELECT COUNT("n_n") FROM mononuclide_data WHERE "nuclide" = '141 Pr'

Question: What is the name of the element with isotopic mass of 158.925 34(2)?
SQL: SELECT "element" FROM mononuclide_data WHERE "isotopic_mass_u" = '158.925 34(2)'