Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub
ChemistryGENERAL CHEMISTRYElectronic ConfigurationMedium2 minQB
ChemistryMediummultiple choice
Which of the following have an electron configuration ?
Options:(select one or more)
Answer:
A, C
Solution:
An (18 + 2) electron configuration means the species has a closed shell of 18 electrons (d¹⁰) with an additional ns² inert pair.
- Pb²⁺: Pb = [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p² → Pb²⁺ = [Xe] 4f¹⁴ 5d¹⁰ 6s² → 18 + 2 configuration
- Cd²⁺: Cd²⁺ = [Kr] 4d¹⁰ → only 18 electrons, no ns² pair
- Bi³⁺: Bi³⁺ = [Xe] 4f¹⁴ 5d¹⁰ 6s² → 18 + 2 configuration
- SO₄²⁻: Molecular ion, not considered for this configuration
Correct Answer: (A) Pb²⁺ and (C) Bi³⁺
Stream:JEESubject:ChemistryTopic:GENERAL CHEMISTRYSubtopic:Electronic Configuration
⏱ 2mℹ️ Source: QB
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