PERIODIC TABLE - REVISION QUESTIONS 1. Use your Periodic Table to answer the following: a. Explain the relationship between the group number and the number of electrons in the valence shell. b. What does the period number of each element correspond to? c. Why can helium be placed in group 18? d. Explain the position of hydrogen. 2. For each of the following pairs of elements, state the element with the greatest electronegativity: a. Li and K b. F and Br 3. Explain why an atom of caesium (Cs) is larger than an atom of sodium (Na) 4. Which element has more metallic character: sodium (Na) or silicon (Si)? 5. Which element has more non-metallic character: carbon (C) or aluminium (Al) 6. Use the periodic table to find the name and symbol for the element in a. Group 2, period 2 b. Group 13, period 4 c. Group 18, period 3 7. In which group and period is element number 35? What is its name and symbol?