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_name_51 (part_number_s_ VARCHAR, model_number VARCHAR)
### Question:
Which part number was used for the Atom Z500 processor?
### Answer:
SELECT part_number_s_ FROM table_name_51 WHERE model_number = "atom z500"