1. (i) Which element has the most metallic character?   2. (ii) Which element would be expected to have the highest electro-negativity?   3. (iii) If the electronic configuration of Aluminium is 2, 8, 3, how many electrons are there in the outer shell of Thallium?   4. (iv) The atomic number of Boron is 5. Write the chemical formula of the compound formed when Boron reacts with Chlorine.   5. (v) Will the elements in the group to the right of this Boron group be more metallic or less metallic in character? Justify your answer.