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Answer choice A.

Lithium is in group 1 of the periodic table, therefore it is a halogen. And halogens have only one valence electron on their outer most shell.

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sebassandin

Answer:

A-1

Explanation:

Hello,

Lithium has the following electron configuration:

[tex]1s^22s^1[/tex]

It means that in the outermost energy level ([tex]2s[/tex]) it has one electron.

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