user: Question: What is the covalent (single bond) value of sodium?
Columns: ['number', 'symbol', 'name', 'empirical †', 'Calculated', 'van der Waals', 'Covalent (single bond)', 'Covalent (triple bond)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'H', 'hydrogen', '25', '53', '120', '38', 'no data']
SQL:

assistant: SELECT "Covalent (single bond)" FROM "Table" WHERE "name" = 'sodium';