Memorising Electrovalencies

• phosphide


  P³⁻
• nitride


  N³⁻
• oxide


  O²⁻
• hydroxide

  OH⁻
• iodide


  I⁻
• bromide


  Br⁻
• chloride


  Cl⁻
• fluoride

  F⁻
• hydride

  H⁻
• lead (IV)


  Pb⁴⁺
• tin (IV)


  Sn⁴⁺
• iron (III)


  Fe³⁺
• chromium (III)


  Cr³⁺
• aluminium


  Al³⁺
• zinc


  Zn²⁺
• tin (II)


  Sn²⁺
• nickel (II)


  Ni²⁺
• mercury (II)


  Hg²⁺
• lead (II)


  Pb²⁺
• iron (II)


  Fe²⁺
• copper (II)


  Cu²⁺
• cobalt


  Co²⁺
• chromium (II)


  Cr²⁺
• barium


  Ba²⁺
• calcium


  Ca²⁺
• magnesium


  Mg²⁺
• ammonium


  NH₄⁺
• silver


  Ag⁺
• copper (I)


  Cu⁺
• caesium


  Cs⁺
• potassium


  K⁺
• sodium


  Na⁺
• lithium


  Li⁺