(c) Give the four quantum numbers for the valence electron in aluminium and explain the significance of each.

When a nonmetal oxide reacts with water, it forms anoxoacid with the same nonmetal oxidation state. Give the name and formula of the oxide used to prepare each of these oxoacids:(a) hypochlorous acid; (b) chlorous acid; (c) chloric acid; (d) perchloric acid; (e) sulfuric acid; (f ) sulfurous acid; (g) nitricacid; (h) nitrous acid; (i) carbonic acid; ( j) phosphoric acid.

24. Which member of the following pairs has the larger radius? Provide your reasoning. (a) Al or S (b) Cl or Ca²+ (c) Ba or Sn (d) Na+ or K

Give TWO reasons why aluminium metal was not commonly used till last century, even though it is one of the most common elements on earth. (b) Why are copper and lithium such important elements today?