Multiple Choice
Which of the following is the number of protons in the sulfide ion, S^{2-}?
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2. Atoms & Elements
Ions
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The ion configuration for P^{3-} would have the same electron configuration as which element?
A
Neon
B
Sulfur
C
Argon
D
Phosphorus
Verified step by step guidance1
Identify the atomic number of phosphorus (P), which is 15. This means a neutral phosphorus atom has 15 electrons.
Recognize that the ion P^{3-} means phosphorus has gained 3 extra electrons, so the total number of electrons is 15 + 3 = 18.
Recall that the electron configuration depends on the number of electrons, so P^{3-} has 18 electrons.
Determine which element has 18 electrons in its neutral state by looking at the periodic table; this element is argon (Ar).
Conclude that the electron configuration of P^{3-} is the same as that of argon, because they both have 18 electrons.
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