Atomic Properties - Electronic Configurations

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The atoms of group 17 have seven electrons in the outermost shell, and have the general electronic configuration ns2np5.

Electronic configuration of group 17 elements

 Element  Symbol  Atomic No.  Electronic Configuration  Abundance In Earth’s Crust (in ppm)
 Fluorine  F  9  [He] 2s2 2p5  800
 Chlorine  Cl  9  [Ne] 3s2 3p5  800
 Bromine  Br  9  [Ar] 3d10 4s2 4p5  480
 Iodine  I  17  [Kr] 4d105s2 5p5  
 Astatine  At  35
53
85		  [Xe] 4f145d106s2 6p3  2
0.3
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