Multiple Choice
Which of the following represents the formula of the ion formed when potassium achieves a noble-gas electron configuration?
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2. Atoms & Elements
Ions
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What are the charges on the copper and phosphide ions in the compound Cu3P?
A
Copper ion: +1, Phosphide ion: -3
B
Copper ion: +2, Phosphide ion: -2
C
Copper ion: +3, Phosphide ion: -1
D
Copper ion: +2, Phosphide ion: -3
Verified step by step guidance1
Identify the chemical formula given: Cu\_3P, which consists of copper (Cu) and phosphide (P) ions.
Recall that the compound is electrically neutral overall, so the total positive charge from copper ions must balance the total negative charge from phosphide ions.
Recognize that phosphide is the ion formed from phosphorus, which commonly has a charge of -3, so the charge on the phosphide ion is likely -3.
Let the charge on each copper ion be +x. Since there are 3 copper ions, the total positive charge is 3\times x.
Set up the charge balance equation: 3\times x + (-3) = 0, then solve for x to find the charge on each copper ion.
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