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QuestionChemistry

"Enter the ionic formula for the compounds formed between the following pairs: Na+ and Se^2− Rb+ and P^3− Cs+ and I− "
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Answer

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Step 1:
I'll solve this ionic compound formula problem step by step:

Step 2:
: Understand the Ionic Bonding Rules

- Ionic compounds form when positively charged cations and negatively charged anions combine - The total charge must balance to zero - The number of ions will adjust to achieve charge neutrality

Step 3:
: Na+ and Se^2− Compound

- Formula: $$Na_{2}Se
- Cation: Sodium (Na+) - Anion: Selenide (Se^2−) - To balance charges, we need 2 Na+ ions for every 1 Se^2− ion

Step 4:
: Rb+ and P^3− Compound

- Formula: $$Rb_{3}P
- Cation: Rubidium (Rb+) - Anion: Phosphide (P^3−) - To balance charges, we need 3 Rb+ ions for every 1 P^3− ion

Step 5:
: Cs+ and I− Compound

- Formula: $$CsI
- Cation: Cesium (Cs+) - Anion: Iodide (I−) - These ions have equal and opposite charges of + 1 and - 1

Final Answer

- Na+ and Se^2−: Na_{2}Se - Rb+ and P^3−: Rb_{3}P - Cs+ and I−: CsI