[tex] \begin{gathered} \begin{array}{ |c|c| } \pmb{ \sf{Electrolyte}}& \textsf{ \textbf{Formula of Ions}}\\ \\ \\ \sf sodium \: sulphate& \bf \red{Na_2SO_4} \\ \\ \sf magnesium \: chloride& \red{ \bf MgCl_2} \\ \\ \sf zinc \: sulphate & \bf \red{ZnSO_4} \\ \\ \sf potassium \: iodine& \red{ \bf KI} \\ \\ \sf sodium \: hydroxide& \bf \red{NaOH} \\ \\ \sf Copper(II) \: chloride & \red{ \bf CuCl_2} \\ \\ \sf silver \: nitrate& \red{ \bf{AgNO_3}}\end{array}\end{gathered}[/tex]
[tex]\\\\\\[/tex]
valency:
Sodium - [tex]\sf Na^+[/tex]
sulphate - [tex]\sf {SO_4}^{-2}[/tex]
valency:
Magnesium- [tex]\sf Mg^{+2}[/tex]
Chloride- [tex]\sf Cl^{-1}[/tex]
valency:
zinc- [tex]\sf Zn^{+2}[/tex]
sulphate [tex]\sf SO_4^{-2}[/tex]
valency:
potassium - [tex]\sf K^{+1}[/tex]
sulphate - [tex]\sf I^{-1}[/tex]
valency:
sodium - [tex]\sf Na^{+1}[/tex]
hydroxide - [tex]\sf OH^{-1}[/tex]
valency:
Copper(II) - [tex]\sf Cu^{+2}[/tex]
chloride - [tex]\sf Cl^{-1}[/tex]
valency:
Silver - [tex]\sf Ag^{+1}[/tex]
nitrate - [tex]\sf NO_3^{-1}[/tex]
[tex]\\\\\\[/tex]
Key Points :
- Remember metals always have positive valency because lose their electrons from their valence shell to obtain Nobel gas configuration.
- And bases always have negative valency because they gain electronics to complete their shell and hence to obtain Nobel gas configuration.
- Metals are always written before bases
- While writing formula if both Ions have same valency then we don't write them in formula.
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