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Iron does not occur in the nature as pure iron because it readily combines with the oxygen in the air to become Fe2O3 or Fe3O4.

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it forms oxide with the gases present in the atmosphere

 

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Iron does not occur naturally in the crust of the earth because it quickly reacts with oxygen present in the atmosphere and becomes Ferric Oxide 

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due to presence of oxidising and reducing gases in the air as  follows hydrogen, oxygen and  gaseous H2O metal iron oxidising preferrably into ferric/ferrous / ferrosoferric  oxide .

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during the condensation of the gaseus cloud of the earth the sepration of the element took place according to there atomic weight, so the havier element settle towards the center of planet while the lighter element occupy peripheral position.

 

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