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QuestionChemistry

Write the formula for the following covalent compound: phosphorus triiodide.
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Answer

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Step 1:
I'll solve this step-by-step using proper chemical nomenclature and LaTeX formatting:

Step 2:
: Identify the elements

- Phosphorus (P) is a nonmetal - Iodine (I) is a nonmetal - This indicates a covalent compound will form

Step 3:
: Determine the oxidation states

- Phosphorus typically forms compounds with a - 3 oxidation state - Iodine typically has a - 1 oxidation state

Step 4:
: Determine the formula

- The formula will be $$PI_{3}
- To balance the charges, we need 3 iodine atoms for each phosphorus atom

Step 5:
: Name verification

- "Phosphorus" is the base name for the phosphorus element - "Tri-" prefix indicates 3 iodine atoms - "Iodide" is the suffix for iodine - Therefore, "phosphorus triiodide" is the correct systematic name

Final Answer

PI_{3} (phosphorus triiodide)