CREATE TABLE table_40355 ("number" FLOAT, "symbol" CLOB, "name" CLOB, "empirical \\u2020" CLOB, "Calculated" CLOB, "van der Waals" CLOB, "Covalent  ( single bond ) " CLOB, "Covalent  ( triple bond ) " CLOB)

What is the covalent (single bond) value of sodium?
SELECT "Covalent (single bond)" FROM table_40355 WHERE "name" = 'sodium'
SELECT "Covalent (single bond)" FROM "table_40355" WHERE "name" = 'sodium'