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Aluminium
Antimony
2
Arsenic
2
Barium 2+
2
Beryllium
2
Bismuth
2
Boron
2
Bromide
2
Cadmium
2
Caesium
2
Calcium
2
Chromium
2
Cobalt
2
Copper
Distance
2
Dysprosium
2
Erbium
2
Europium
2
Gadolinium
2
Gallium
2
Germanium
2
Hafnium
2
Holmium
2
Iron
2
Lanthanum
2
Lead
Lithium
2
Lutetium
2
Magnesium
2
Manganese 2+
2
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