Multiple Choice
What is the correct name for the compound with the formula CrPO_4?
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3. Chemical Reactions
Naming Ionic Compounds
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between magnesium and nitrogen?
A
Mg3N2
B
MgN
C
MgN2
D
Mg2N3
Verified step by step guidance1
Identify the charges of the ions formed by magnesium and nitrogen. Magnesium is in Group 2 and typically forms a Mg^{2+} ion, while nitrogen is in Group 15 and typically forms an N^{3-} ion.
Determine the ratio of magnesium ions to nitrogen ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: 2+ times the number of magnesium ions plus (-3) times the number of nitrogen ions equals zero. Mathematically, this is 2x + (-3)y = 0, where x and y are the subscripts in the formula.
Find the smallest whole number values of x and y that satisfy the charge balance. This involves finding the least common multiple of the charges 2 and 3, which is 6, so 3 magnesium ions (3 × 2+ = 6+) and 2 nitrogen ions (2 × 3- = 6-) balance the charges.
Write the chemical formula using these subscripts: Mg_{3}N_{2}.
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