An ion with a charge of positive two, and the same electron configuration as the chloride ion, is the
A - VCE - SSCE Chemistry - Question 6 - 2002 - Paper 1
Question 6
An ion with a charge of positive two, and the same electron configuration as the chloride ion, is the
A. phosphide ion.
B. sulfide ion.
C. magnesium ion.
D. calcium ... show full transcript
Worked Solution & Example Answer:An ion with a charge of positive two, and the same electron configuration as the chloride ion, is the
A - VCE - SSCE Chemistry - Question 6 - 2002 - Paper 1
Step 1
Identify Ion with Positive Charge
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Answer
To solve this question, we need to find the ion that possesses a charge of +2. The chloride ion (Cl⁻) has an electron configuration of [Ne]3s²3p⁶, representing a stable noble gas configuration with 18 electrons.
Step 2
Determine Electron Configuration of Positive Ion
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Answer
An ion with a charge of +2 means it has lost 2 electrons. Therefore, to have the same electron configuration as the chloride ion, which has 18 electrons, the target ion should also have 18 electrons.
Step 3
Evaluate Each Option
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Answer
Now let's examine each option:
A. Phosphide ion: This ion has a charge of -3 and does not match.
B. Sulfide ion: This ion also has a charge of -2, thus does not match.
C. Magnesium ion: This ion (Mg²⁺) has lost 2 electrons from Mg (atomic number 12), resulting in 10 electrons, which does not match.
D. Calcium ion: This ion (Ca²⁺) has lost 2 electrons from Ca (atomic number 20), resulting in 18 electrons, matching the electron configuration of the chloride ion.
Step 4
Conclude
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Answer
Based on the evaluations, the correct answer is D. calcium ion, as it is the only ion with a +2 charge and an electron configuration equivalent to that of the chloride ion.
