What is the number of atoms per element with cr(nh3)6(no3)3

The number of atoms  per element with  Cr(NH3)6(NO3)3  is  as below

Chronium  ( Cr) =1

Nitrogen (N)= 9

Hydrogen (H)=18

Oxygen (O)= 9

 Explanation

Cr(NH3)6(NO3)3  has  four element , that is  chronium (Cr), Nitrogen (N), Hydrogen(H)  number  of  atoms per element in Cr(NH3)6(NO3)3  is determined as followsfor  Cr is =1 to  since there is only one atom  of Cr

               N=  ( 1 x  6)+    (1 x3)= 9  atoms

              H=  3 x6= 18 atoms

             O=  3 x3 =  9 atoms

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Outermost (valence) electrons