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sodium
Na+
potassium
k+
silver
Ag+
hydrogen
H+
Ammonium
NH4+
calcium
ca2+
copper(ii)
cu2+
magnesium
Mg2+
Zinc
zn2+
iron(ii)
Fe2+
iron(iii)
Fe3+
aluminium
Al3+
chromium(iii)
Cr3+