CREATE TABLE table_70787 ("Lithium" TEXT, "Sodium" TEXT, "Potassium" TEXT, "Rubidium" TEXT, "Caesium" TEXT)

what is the properties of sodium when lithium is h a l o g e n s and rubidium is nacl (2.1)?
SELECT "Sodium" FROM table_70787 WHERE "Lithium" = 'h a l o g e n s' AND "Rubidium" = 'nacl (2.1)'
SELECT "Sodium" FROM "table_70787" WHERE "Lithium" = 'h a l o g e n s' AND "Rubidium" = 'nacl (2.1)'