Chemical Periodicity
For the 1987 Copyright of The Addison Wesley Textbook
2) Why do lower rows of the periodic table contain more elements?
3) Why does atomic radius decrease as you move left to right across a period?
4) Explain atoms become smaller as positive ions. Explain why they become larger as
negative ions.
5) Why do an atom's successive ionization energies not increase smoothly?
6) An unknown element has the following successive ionization energies:
1st ionization energy: 589 kJ/mol
2nd ionization energy: 1144 kJ/mol
3rd ionization energy: 4905 kJ/mol
4th ionization energy: 6465 kJ/mol
Predict the element's family.
7) An unknown element has a positive electron affinity, a very high first ionization energy,
and one of teh smallest atomic radii in its period. Predict this element's family in the
periodic table.
8) Place these three elements in order of decreasing electronegativity: Al, O, and S.
9) Place these four elements in order of increasing atomic radii: In, B, N, Al
10) Which one of these elements has the highest 2nd ionization energy: Ca, K, Ga.
