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Arrange the following ions into monovalent, divalent and trivalent:
 
Answer variants:
\( Nd^3{^+}\)
\(Cd^2{^+}\)
\(Br^-\)
\( Si^4{^+}\)
 
1. Monovalent -
 
2. Divalent - 
  
3. Trivalent -