Rewrite the following sentences by using the correct symbol > (greater than) or < (less than) in the blanks given:
1. The ionization potential of Potassium is _______ that of Sodium.
2. The electronegativity of Iodine is _______ that of Chlorine.
1. The ionisation potential of Potassium is less than that of sodium.
2. The electronegativity of Iodine is less than that of chlorine.