Answer:
Fluorine.
Step-by-step explanation:
I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.
Answer: Fluorine
Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.
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