Names:
Purpose
Determine the trends, if they exist, for atomic size and ionization energy in the Periodic
Table.
Materials
Graph paper
Procedure
1. Use the information from the section of the periodic table. Be sure to give each graph a title and to label each axis.
2. For elements 3-20, make a graph of atomic radius as a function of atomic number. Plot atomic number on the X axis and atomic radius on the Y-axis.
3. For elements in Family 1A (1) and Family 2A (2), graph period number vs. atomic radius. Use a different color or symbol for each line.
4. For elements 3-20, make a graph of ionization energy as a function of atomic number. Plot atomic number on the X-axis and ionization energy on the Y-axis.
5. For elements in Family 1(1A) and Family 2 (2A), graph period number vs. ionization energy. Use a different color or symbol for each line.
| IA (1) | IIA (2) | IIIA (13) | IVA (14) | VA (15) | VIA (16) | VIIA (17) | VIIIA (18) | |
| 2 | 3 Li 1.23 124 | 4 Be 0.89 215 | 5 B 0.80 191 | 6 C 0.77 260 | 7 N 0.70 335 | 8 O 0.66 314 | 9 F 0.64 402 | 10 Ne 0.67 497 |
| 3 | 11 Na 1.57 119 | 12 Mg 1.36 176 | 13 Al 1.25 138 | 14 Si 1.17 188 | 15 P 1.10 242 | 16 S 1.04 239 | 17 Cl 0.99 299 | 18 Ar 0.98 363 |
| 4 | 19 K 2.03 100 | 20 Ca 1.74 141 | ||||||
| 5 | 37 Rb 2.1 696 | 38 Sr 1.91 131 | 8 O 0.66 314 | Atomic Symbol Atomic Ionization | number radius energy | |||
| 6 | 55 Cs 2.35 90 | 56 Ba 1.98 120 |
Analysis
1. What happens to the atomic radius as the atomic number increases across a period? Down a family?
2. What happens to the ionization energy as the atomic number increases across a period? Down a family?
Conclusion
1. Why does atomic radius change as it does?
2. Why does the ionization energy change as it does?
Lab Summary Paragraph