QQuestionChemistry
QuestionChemistry
Which of the following is the Lewis dot structure for the lithium ion?
A. [:Li:]²⁻
B. [Li]⁺
C. [:Li]⁻
D. [Li]²⁺
E. [:Li]⁺
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the Lithium Ion
- Its atomic number is 3, with electron configuration $$1s^{2} 2s^{1}
- Lithium (Li) is an alkali metal in Group 1 of the periodic table - To form an ion, lithium will lose its outermost electron
Step 3:: Determine the Ion's Charge
- The charge will be $$1^{+}
- When lithium loses its single valence electron, it becomes a positive ion - This means it will have 2 electrons in its inner shell and no electrons in its outer shell
Step 4:: Analyze the Lewis Dot Structure
- For a lithium ion, there will be no dots around the $$Li^{1+}$$ symbol
- A Lewis dot structure shows valence electrons around an atom
Step 5:: Evaluate the Given Options
- Option A ([:Li:]²⁻) is incorrect - this would have extra electrons - Option B ([Li]⁺) is the correct representation - Option C ([:Li]⁻) is incorrect - this would have an extra electron - Option D ([Li]²⁺) is incorrect - the charge is too high - Option E ([:Li]⁺) is incorrect - the dot notation is unnecessary
Final Answer
B. [Li]⁺
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