Multiple Choice
Which of the following ions is not isoelectronic with the others?
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2. Atoms & Elements
Ions
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What is the charge on a chloride ion?
A
0
B
2-
C
1-
D
1+
Verified step by step guidance1
Recall that a chloride ion is formed when a chlorine atom gains electrons to achieve a full outer electron shell, similar to the nearest noble gas configuration.
Understand that chlorine, in its neutral state, has 17 protons and 17 electrons, resulting in no net charge.
When chlorine gains one electron, the number of electrons becomes 18 while the number of protons remains 17.
The difference between the number of protons and electrons determines the charge of the ion: charge = (number of protons) - (number of electrons).
Since there is one more electron than protons, the chloride ion carries a charge of 1-, which is written as Cl⁻.
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