what is the properties of sodium when rubidium is nacl (2.1)?
CREATE TABLE table_name_98 (sodium VARCHAR, rubidium VARCHAR)
SELECT sodium FROM table_name_98 WHERE rubidium = "nacl (2.1)"
### Context: CREATE TABLE table_name_98 (sodium VARCHAR, rubidium VARCHAR) ### Question: what is the properties of sodium when rubidium is nacl (2.1)? ### Answer: SELECT sodium FROM table_name_98 WHERE rubidium = "nacl (2.1)"