Part B Thinking/Investigating /12 Answer the following questions: 1. Explain the significance of the peaks on the graph of the atomic radius vs atomic number. (4 marks)

2. What do you estimate to be the missing value of the electronegativity for element #15? Show on the graph how did you find the missing value (2marks) Electronegativity _____________

3. Using a periodic table, select an appropriate element that satisfies the condition given ( 1mark each) a. particle with the larger radius : Ca 2+ ion or Mg 2+ ion. ____________ b. halogen with the highest IE. _____________ c. element with the highest EA in Gr16: ________________ d. As you go from left to write across a period, the electron affinity (decreases/ increases). ____________________ e. Arrange the following elements in order of increasing the atomic radius. Sc, Ga, Co _____________________ f. Arrange the following elements in order of increasing reactivity. S, Te, O, _______________________