| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| effective nuclear charge is | 1.46 | 0.9 | 9779 | 54 | 27 |
| effective | 1.9 | 0.1 | 3530 | 92 | 9 |
| nuclear | 0.8 | 0.2 | 4817 | 83 | 7 |
| charge | 1.37 | 0.6 | 4294 | 20 | 6 |
| is | 1.21 | 0.4 | 6862 | 67 | 2 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| effective nuclear charge is | 1.9 | 0.7 | 542 | 68 |
