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Fluorine | Sodium | Oxygen
These are very low complexity temperaments tempering out the minor septimal semitone, 21/20 and hence equating 5/3 with 7/4, and 10/7 with 3/2.

Fluorine

Commas: 21/20, 243/224

POTE generator: ~3/2 = 663.059

Map: [<1 0 -7 -5|, <0 1 6 5|]
Wedgie: <<1 6 5 7 5 -5||
EDOs: 9, 20bd, 29bd
Badness: 0.0556

Sodium

Commas: 21/20, 54/49

POTE generator: ~7/6 = 320.182

Map: [<1 1 1 2|, <0 2 5 3|]
Wedgie: <<2 5 3 3 -1 -7||
EDOs: 4, 11, 15b
Badness: 0.0558

Oxygen

Commas: 21/20, 175/162

POTE generator: ~7/6 = 169.112

Map: [<1 2 3 3|, <0 -3 -5 -2|]
Wedgie: <<3 5 2 1 -5 -9||
EDOs: 7d, 8
Badness: 0.0599