| Keyword | CPC | PCC | Volume | Length string | Score |
|---|---|---|---|---|---|
| atomic number of oxygen 18 | 0.07 | 0.7 | 5125 | 26 | 1 |
| atomic number of oxygen 16 | 1.07 | 0.5 | 1297 | 26 | 3 |
| atomic number of oxygen 17 | 1.74 | 0.1 | 6628 | 26 | 26 |
| what the atomic number of oxygen | 0.21 | 0.1 | 2121 | 32 | 73 |
| number of electrons in oxygen 18 | 1.36 | 0.8 | 509 | 32 | 41 |
| what's the atomic number of oxygen | 1.04 | 0.3 | 7125 | 34 | 74 |
| mass number of oxygen 18 | 0.87 | 0.1 | 7890 | 24 | 4 |
| the atomic number of oxygen is 8 | 1.2 | 0.5 | 6555 | 32 | 53 |
| atomic number of oxygen atom | 1.04 | 0.1 | 934 | 28 | 90 |
| what is the atomic mass of oxygen-18 | 0.46 | 0.6 | 943 | 36 | 26 |
| atomic weight of oxygen-18 | 0.98 | 0.8 | 6710 | 26 | 72 |
