Weird charges

• Zinc

  Zn2+
• iron(II)

  Fe2+
• iron(III)

  Fe3+
• copper

  Cu2+
• Silver

  Ag2+
• ammonium

  NH4+
• sulfate

  SO4 2-
• carbonate

  CO3 2-
• Nitrate

  NO3-
• hydroxide

  OH-