The electron configuration for an element in the halogen group should always end with a. ns2 np6 b. ns2 np5 c. ns2 np4 d. ns2 np2

All the halogens have 7 electrons in the final shell.  As such in the s p d f electronic configuration form, that would amount to them having the last shell as ns² np⁵ [OPTION B]

The table below reiterates the idea and shows how each element of the Halogen Group does indeed follow this pattern.

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