atomic radius

[113zami]

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C,N,S.....rank them from smallest to biggest? and please explain your reasoning, thanks

 

[Orgodox]

N C S. As you go across (left to right) a period the atomic radius gets smaller so N is smaller than C. As you go down a group atomic radius gets bigger because you add an extra energy level and the electrons in outermost shell fell the attraction of the protons int he nucleus less ie shielding

 

[ddswillbeback]

S>C>N. S has the highest atomic radius since it has one main level of energy more than c and N. Notice that S is located in the 3rd period vs C and N which are located in the second period. Between C and N, C has higher atomic radius since it has less number of protons in its nuclease, therefore it will be less attraction force between its valence electrons and nuclei and leads to higher atomic radius than N. Overall remember that as you move toward F the size of atomic radius decreases.