QQuestionChemistry
QuestionChemistry
"For each of the three ionic compounds, select which main group X belongs to.
(a) X^3PO^4 (b) CaX^2 (c) X^2(SO4)3
Group 1A (1) Group 1A (1) Group 1A (1)
Group 2A (2) Group 2A (2) Group 2A (2)
Group 3A (13) Group 3A (13) Group 3A (13)
Group 4A (14) Group 4A (14) Group 4A (14)
Group 5A (15) Group 5A (15) Group 5A (15)
Group 6A (16) Group 6A (16) Group 6A (16
Group 7A (17) Group 7A (17) Group 7A (17)
Group 8A (18) Group 8A (18) Group 8A (18)"
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Answer
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Step 1: Identify the ionic compound's cation and anion.
In an ionic compound, the cation is the positive ion and the anion is the negative ion. The charge of the cation and anion determine which group they belong to.
Step 2: Identify the cation and anion for each compound.
(a) X^3PO^4: Phosphate ion (PO4)^3 - has a charge of - 3, so X must have a charge of + 3. This means X is in Group 3A (13). (b) CaX^2: Calcium ion (Ca^2 +) has a charge of + 2, so X must have a charge of - 2. This means X is in Group 2A (2). (c) X^2(SO4)3: Sulfate ion (SO4)^2 - has a charge of - 2, so X must have a charge of + 1 to balance the compound. However, a single X atom cannot have a charge of + 1, so this compound is not possible.
Final Answer
(a) X is in Group 3A (13). (b) X is in Group 2A (2). (c) The compound X^2(SO4)3 is not possible.
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