| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| effective nuclear charge trend | 1.73 | 0.7 | 9254 | 36 | 30 |
| effective | 1.5 | 0.5 | 4064 | 39 | 9 |
| nuclear | 1.19 | 0.1 | 4623 | 28 | 7 |
| charge | 1.24 | 0.2 | 806 | 88 | 6 |
| trend | 1.58 | 0.4 | 2268 | 50 | 5 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| effective nuclear charge trend | 1.97 | 0.4 | 5009 | 47 |
