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4Fe  +  3O₂   →   2Fe₂O₃

Explanation:

The chemical reaction is given as:

          Fe  +  O₂   →   Fe₂O₃

To balance an equation implies that the number of atoms and moles must be conserved.

  using the coefficients a,b and c, let use a mathematical approach to balance the expression;

           aFe  +  bO₂   →   cFe₂O₃

Conserving Fe: a  = 2c

                     O: 2b  = 3c

let c  = 1, a  = 2 , b  =  

  multiply through by 2 ;

         a  = 4, b  = 3 and c = 2

                  4Fe  +  3O₂   →   2Fe₂O₃

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.