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Name :An alkali metal in period  3  and halogen in period  2  .

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Alkali metals elements of group 1 in which the last electron enters in s orbital and it has ns1 electronic configuration.
Halogen elements are the elements of group seventeen in which the last electron enters in p orbital and ns2 np7 electronic configuration.
An alkali element in period 3 and halogen in period 2 is sodium and fluorine respectively.

Final Answer:
Hence the correct answer is sodium and fluorine respectively.

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