24. what is the formula for lithium sulfide?

a) lis

b) $\text{li}_2\text{s}$

c) $\text{lis}_2$

d) $\text{li}_2\text{s}_2$

Question

24. what is the formula for lithium sulfide?

a) lis

b) $\text{li}_2\text{s}$

c) $\text{lis}_2$

d) $\text{li}_2\text{s}_2$

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Ionic Compound Formulas" ], "new_concepts": [], "current_concepts": [ "Ionic Compound Formulas", "Ionic Charge", "Metals and Nonmetals" ] } ## Identify ionic charges of constituent elements $$ \begin{aligned} &\text{Lithium (Li): Group 1 metal} ightarrow \text{Li}^+\ &\text{Sulfur (S): Group 16 nonmetal} ightarrow \text{S}^{2-} \end{aligned} $$ ## Balance charges to find chemical formula $$ \begin{aligned} &2(\text{Li}^+) + 1(\text{S}^{2-}) = 0\ &\text{Formula} = \text{Li}_2\text{S} \end{aligned} $$

A) LiS

B) $\text{Li}_2\text{S}$

C) $\text{LiS}_2$

D) $\text{Li}_2\text{S}_2$

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Chemistry", "Ionic Compound Formulas" ] }

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Question

Explanation:

Identify ionic charges of constituent elements

Balance charges to find chemical formula

Answer: