Equations of reactions of period 3 elements with oxygen and chlorine.
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Period 3 Elements with Oxygen:

Sodium        4Na_(s) + O_2(g) ---> 2Na₂O_(s)

Sodium        2Na_(s) + O_2(g)  ---> Na₂O_2(s)

Magnesium     2Mg_(s) + O_2(g) ---> 2MgO_(s)

Aluminium     4Al_(s) + 3O_2(g) ---> 2Al₂O_3(s)

Silicon       Si_(s) + O_2(g) ---> SiO_2(s)

Phosphorus    P_4(s)   + 5O_2(g) ---> P₄O_10(s)

Sulphur       S_(s)  + O_2(g) ---> SO_2(g)

Sulphur       2S_(s)  + 3O_2(g) ---> 2SO_3(g)

Chlorine does not react directly with water but Cl₂O does exist.

Period 3 Elements with Chlorine:

Sodium       2Na_(s) + Cl_2(g)---> 2NaCl_(s)

Magnesium    Mg_(s) + Cl_2(g) ---> MgCl_2(s)

Aluminium    2Al_(s)+ Cl_2(g) --->  AlCl_3(s)

Aluminium    2Al_(s)+ 3Cl_2(g)---> Al₂Cl_6(g)

Silicon      Si_(s) + Cl_2(g) ---> SiCl_4(l)

Phosphorus   2P_(s) + Cl_2(g) --->  2PCl_3(l)

Phosphorus   PCl_3(s) + Cl_2(g) ---> PCl_5(s)

Sulphur      S_(s) + Cl_2(g)  --->   SCl_2(l)

Period 3 Elements with Water:

Sodium       2Na_(s) + Cl_2(g)---> 2NaCl_(s)

Magnesium    Mg_(s) + H₂O_(g) --->  MgO_(s)+ H_2(g)

Chlorine     Cl_2(g) + H₂0 ---> HOCl_(aq) + HCl_(aq)

Sulphur, phosphorus and silicon don't react.

Aluminium    2Al_(s)+ Cl_2(g) --->  AlCl_3(s)

Other Notes in this Category

1. Acid Base Character of Period 3 Oxides
2. Acid-Base Character of Group 4 Oxides
3. Covalent Radius
4. Defintions: Electrophile, nucleophile, radical
5. Equations of reactions of period 3 elements with oxygen and chlorine.
6. Ionization Energy and Electron Affinity
7. Ionization Energy and Electron Affinity 2
8. Thermal Stability of gp1 and 2 carbonates.

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