Task: Text Categorization
Input (English): This element has a characteristic D line at 589 nanometers and is produced in the electrolytic Castner process. The movement of this element is counteracted by the movement of potassium in a namesake "pump" based off of active transport. A strong base containing hydroxide and this metal is known as lye while baking soda consists of a compound containing this metal and bicarbonate. For 10 points, name this alkali metal found along with chlorine in table salt.
Output (English): Science