Theory:

What is chemical properties?
A chemical property is a feature of a substance that may be seen when involved in a chemical reaction.
(i) Valence electrons:
  
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Sodium valence shell
  
Metal's atoms normally have one, two, or three electrons in their outermost (valence) shell.
  
(ii) Formation of ions:
  
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Sodium (positive) ion formation
 
Metals are electropositive as they lose electrons to produce positive ions.
  
(iii) Discharge of ions:
  
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Electrolysis ions discharging
  
Metals are releases ions at the cathode during the electrolysis of their compounds.
  
(iv) Atomicity:
 
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Vapour state monoatomic molecule
  
Metal molecules in the vapour state are generally monoatomic.
 
(v) Nature of oxides:
  
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Metal oxides are usually basic (alkaline) in nature.