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Which has the electron configuration of a noble gas? A H⁺ B O⁻ C Se²⁻ D Zn²⁺ - AQA - A-Level Chemistry - Question 10 - 2021 - Paper 3
Question 10
Which has the electron configuration of a noble gas? A H⁺ B O⁻ C Se²⁻ D Zn²⁺
Worked Solution & Example Answer:Which has the electron configuration of a noble gas? A H⁺ B O⁻ C Se²⁻ D Zn²⁺ - AQA - A-Level Chemistry - Question 10 - 2021 - Paper 3
Step 1
C Se²⁻
Answer
To determine which species has the electron configuration of a noble gas, we can start by examining the electron configurations of each option:
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A H⁺: The hydrogen ion (H⁺) has lost its only electron, resulting in an electron configuration of 0, which does not represent a noble gas.
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B O⁻: The oxide ion (O⁻) has gained one electron, leading to a configuration of 1s²2s²2p³, which is not that of a noble gas either.
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C Se²⁻: The selenide ion (Se²⁻) gains two electrons, resulting in an electron configuration of 1s²2s²2p⁶3s²3p⁶, which is the same as the noble gas configuration of Krypton (Kr).
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D Zn²⁺: The zinc ion (Zn²⁺) loses two electrons and has an electron configuration of 1s²2s²2p⁶3s²3p⁶3d¹⁰, which is also not a noble gas configuration.
Based on this analysis, the correct answer is C Se²⁻ because it matches the electron configuration of a noble gas.