General knowledge

• Valency of Oxygen:

  -2
• Valency of Hydrogen:

  +1
• Valency of Helium:

  0/Stable
• Valency of Lithium:

  +1
• Valency of Beryllium:

  +2
• Valency of Aluminium:

  +3
• Valency of Silicon:

  +/- 4
• Valency of Phosphorus:

  -3
• Valency of Sulphur:

  -2
• Valency of Chlorine:

  -1
• Valency of Argon:

  0/Stable
• Valency of Boron:

  +3
• Valency of Carbon:

  +/-4
• Valency of Nitrogen:

  -3
• Valency of Fluorine:

  -1
• Valency of Neon:

  0/Stable
• Valency of Potassium:

  +1
• Valency of Calcium:

  +2
• Valency of Scandium:

  +3
• HCl is...

  Hydrochloric Acid