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Table 3
Sodium-to-potassium ratios in the solar system.
| Object | Na/K | Source | |
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| Mercury surface | 24 | Evans et al. (2012), Peplowski et al. (2012) | |
| Lunar crust | 7–9 | Lodders & Fegley (1998, p. 177) | |
| Meteorites | 7–9 | Lodders & Fegley (1998, p. 311) | |
| Earth atmosphere | 20–150 | Gault & Rundle (1969) | |
| Earth seawater | 27 | Lodders & Fegley (1998, p. 164) | |
| Earth crust | 2 | Lodders & Fegley (1998, p. 143) | |
| Solar | 15.5 | Asplund et al. (2009) | |
| Solar system | 15 | Lodders & Fegley (1998, p. 80) | |
| 67P/ C-G Both hemispheres | 9.5 | This work | |
Notes. Uncertainties in our ratios are 30%. The value for Mercury’s surface is derived from the average Na measurement reported in Evans et al. (2012) and the average K value reported in Peplowsky et al. (2012).
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