Multiple Choice
Which of the following is the typical charge of an oxide ion formed by oxygen?
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2. Atoms & Elements
Ions
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An indium ion with a charge of -3 is formed. How many protons and electrons does this ion have?
A
49 protons and 52 electrons
B
52 protons and 49 electrons
C
49 protons and 46 electrons
D
46 protons and 49 electrons
Verified step by step guidance1
Identify the atomic number of indium (In) from the periodic table, which gives the number of protons in a neutral indium atom.
Recall that the number of protons in an element does not change when it forms an ion; only the number of electrons changes.
Since the ion has a charge of -3, it means the ion has gained 3 extra electrons compared to the neutral atom.
Calculate the number of electrons in the ion by adding 3 to the number of protons (electrons in neutral atom) because of the -3 charge.
Summarize the result: the ion has the same number of protons as neutral indium and the number of electrons equals protons plus 3.
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