20. Arrange the following species from lowest to highest ionization energy: (A)(B) (C) (D) (E)

6. How many of the following statements are NOT TRUE? (i) The Group 3A elements are all metals. (ii) Alkaline earth metals react less vigorously with water than do alkali metals. (iii) Salts can consist of hydrogen. (iv) Because Li is a stronger reducing agent than K and Na in aqueous solution, it reacts more quickly with water than K and Na. (A)0 (B) 1 (C) 2 (D) 3 (E) 4