Question
Which one of the formulas for ionic compound below is incorrect?
a. n =SrCl2 b. Cs2S c. AlCl3 d. Al3P2 e. CaSe
a. n =SrCl2 b. Cs2S c. AlCl3 d. Al3P2 e. CaSe
Answers
GPT-4o mini
To determine which formula for an ionic compound is incorrect, we need to consider the charges of the ions involved in each compound.
a. **SrCl₂**: Strontium (Sr) has a charge of +2 and each chloride (Cl) has a charge of -1. Thus, one strontium ion balances with two chloride ions. This formula is correct.
b. **Cs₂S**: Cesium (Cs) has a charge of +1 and sulfide (S) has a charge of -2. Two cesium ions will balance the charge of one sulfide ion. This formula is correct.
c. **AlCl₃**: Aluminum (Al) has a charge of +3 and each chloride ion (Cl) has a charge of -1. Three chloride ions balance with one aluminum ion. This formula is correct.
d. **Al₃P₂**: Aluminum (Al) has a charge of +3 and phosphide (P) has a charge of -3. The ratio should be one aluminum ion for every one phosphide ion. The correct formula should be **AlP** (one aluminum, one phosphide). Therefore, this formula is incorrect.
e. **CaSe**: Calcium (Ca) has a charge of +2 and selenide (Se) has a charge of -2. One calcium ion balances with one selenide ion. This formula is correct.
Thus, the incorrect formula is **d. Al₃P₂**.
a. **SrCl₂**: Strontium (Sr) has a charge of +2 and each chloride (Cl) has a charge of -1. Thus, one strontium ion balances with two chloride ions. This formula is correct.
b. **Cs₂S**: Cesium (Cs) has a charge of +1 and sulfide (S) has a charge of -2. Two cesium ions will balance the charge of one sulfide ion. This formula is correct.
c. **AlCl₃**: Aluminum (Al) has a charge of +3 and each chloride ion (Cl) has a charge of -1. Three chloride ions balance with one aluminum ion. This formula is correct.
d. **Al₃P₂**: Aluminum (Al) has a charge of +3 and phosphide (P) has a charge of -3. The ratio should be one aluminum ion for every one phosphide ion. The correct formula should be **AlP** (one aluminum, one phosphide). Therefore, this formula is incorrect.
e. **CaSe**: Calcium (Ca) has a charge of +2 and selenide (Se) has a charge of -2. One calcium ion balances with one selenide ion. This formula is correct.
Thus, the incorrect formula is **d. Al₃P₂**.