0: Helium/ He, Neon/ Ne, Krypton/ Kr, 1: Hydrogen/ H, Sodium/ Na, Potassium/ K, Copper/ Cu, Mercury/Hg, Chlorine/ Cl, Iodine/ I , Nitrate/ NO3, Ammonium/NH4, Hydroxide/ OH, Bicarbonate/ HCO3, 2: Calcium/ Ca, Iron/ Fe, Oxygen/ O, Sulphur/ S, Sulphate/ SO4, Carbon trioxide/ CO3, Zinc/ Zn, Magnesium/ Mg, 3: Nitrogen/ N, Aluminium/ Al, Phosphate/ PO4, 4: Carbon/ C,

What's The Valency?

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