1)Iodine + sodium sulphite ->??
Chem. formula: ?+NaSO3
Iodine 係咪有 chem. symbol ...
2)我想問有咩方法可以記到polyatomic ions?
i.e.: hydroxide (OH-), sulphate (SO42-), sulphite (SO32-)...
3)Polyatomic ion 點解有時要加括號?
i.e.: calcium hydrogencarbonate (Ca(HCO3)2)
4)點解Potassium dichromate 唔係 KCr2O7, 而係K2Cr2O7??
Potassium 原本係K, 轉左做ion 都係 K+, 點解會有2?
thx