Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15366768_1 (isotopic_mass___u__ VARCHAR, nuclide VARCHAR)
### Question:
What is the mass of the element with a nuclide that is 169 tm?
### Answer:
SELECT isotopic_mass___u__ FROM table_15366768_1 WHERE nuclide = "169 Tm"