Periodic Trends

1) what trend do you see in atomic radius as you go down a group?
2) what causes this trend?
3) Circle the atom in each pair that has the largest atomic radius
(a) S or O (c) Na or Al
(b) Al or B (d) Br or Ci
(e) Mg or Ca (f) O or F

4) Define ionization energy
5) Why does sodium form a 1 + ion while magnesium forms a 2 + ion?
6) Circle the atom in each pair that has the greater ionization energy
(a) Li or Be (b) Na or K
(c) Ci or S (d) Li or K
(e) Ca or Ba (f) P or Ar