Balance the chemical equations ⚖️ and determine the numbers of the different atoms ⚛️ present in the reactants and products.

• Chemical equation 1 ⚗️
  Sodium oxidation ⚙️
  Word equation:
  
  Sodium + Dioxygen → Sodium oxide
  Chemical equation:
  
  Na + O₂ → Na₂O

  Reactants	Products
  Na →	Na →  ?
  O →	O →  ?

• Chemical equation 2 ⚗️
  Aluminium oxidation ⚙️
  Word equation:
  
  Aluminium + Dioxygen → Aluminium oxide
  Chemical equation:
  
  Al + O₂ → Al₂O₃

  Reactants	Products
  Al →	Al →  ?
  O →	O →  ?

• Chemical equation 3 ⚗️
  Zinc oxidation ⚙️
  Word equation:
  
  Zinc + Dioxygen → Zinc oxide
  Chemical equation:
  
  Zn + O₂ → ZnO
  
  

  Reactants	Products
  Zn →	Zn →  ?
  O →	O →  ?

• Chemical equation 4 ⚗️
  Chromium oxidation ⚙️
  Word equation:
  
  Chromium + Dioxygen → Chromium oxide
  Chemical equation:
  
  Cr + O₂ → CrO₃

  Reactants	Products
  Cr →	Cr →  ?
  O →	O →  ?

📊 RESULT: