Predict the answer to each question according to trends in the periodic table. Justify each answer based on the locations of the elements on the periodic table and/or the shell model.

a. Which has a greater atomic radius, Al or Cl?

b. Which has a greater ionic radius, Na or S?

c. Which has the greatest first ionization energy, Ca or Se?

d. Which has the greatest electronegativity, B or In?

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  1. What is it you don't know how to do? Radius increases as you go down the table and decreases as you move from left to right. Ionic radius is slightly different since electrons are being removed or added so shells are removed or expanded.
    First IP depends upon how far that last electron is away from the nucleus and on the charge of the nucleus.
    Electronegativity generally increases from left to right in the table and decreases from top to bottom.

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  2. okay thanks I didn't know that

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