Question: What is the symbol of the element with an empirical t of 190 and a calculated value of 135?
SQL: SELECT "symbol" FROM "2-1593985-1" WHERE "empirical †" = '190' AND "Calculated" = '135';

Question: What is the name of the element with a calculated value of 56?
SQL: SELECT "name" FROM "2-1593985-1" WHERE "Calculated" = '56';

Question: What is the covalent (single bond) value of sodium?
SQL: SELECT "Covalent (single bond)" FROM "2-1593985-1" WHERE "name" = 'sodium';