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An ion has 18 electrons in the outermost shell, it is[1990]
- a)Cu+
- b)Th4+
- c)Cs+
- d)K+
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+...
Cu+ = 29 – 1 = 28 e– thus the electronic confingration of Cu+ is
Most Upvoted Answer
An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+...
Explanation:
Cu or Copper is the element with the atomic number 29.
Electronic configuration of Copper:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹
The outermost shell of Copper has one electron in 4s orbital, and 10 electrons in 3d orbital.
Therefore, Copper has a total of 11 electrons in the outermost shell.
Option 'A' is incorrect.
Th4 or Thorium is the element with the atomic number 90.
Electronic configuration of Thorium:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s²
The outermost shell of Thorium has 2 electrons in 6s orbital.
Therefore, Thorium has a total of 2 electrons in the outermost shell.
Option 'B' is incorrect.
Cs or Cesium is the element with the atomic number 55.
Electronic configuration of Cesium:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s¹
The outermost shell of Cesium has 1 electron in 6s orbital.
Therefore, Cesium has a total of 1 electron in the outermost shell.
Option 'C' is incorrect.
K or Potassium is the element with the atomic number 19.
Electronic configuration of Potassium:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
The outermost shell of Potassium has 1 electron in 4s orbital.
Therefore, Potassium has a total of 1 electron in the outermost shell.
Option 'D' is incorrect.
Conclusion:
The ion with 18 electrons in the outermost shell is not Cs, K, or Th4.
The only option left is 'A', which is Copper (Cu).
Cu or Copper is the element with the atomic number 29.
Electronic configuration of Copper:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹
The outermost shell of Copper has one electron in 4s orbital, and 10 electrons in 3d orbital.
Therefore, Copper has a total of 11 electrons in the outermost shell.
Option 'A' is incorrect.
Th4 or Thorium is the element with the atomic number 90.
Electronic configuration of Thorium:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s²
The outermost shell of Thorium has 2 electrons in 6s orbital.
Therefore, Thorium has a total of 2 electrons in the outermost shell.
Option 'B' is incorrect.
Cs or Cesium is the element with the atomic number 55.
Electronic configuration of Cesium:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s¹
The outermost shell of Cesium has 1 electron in 6s orbital.
Therefore, Cesium has a total of 1 electron in the outermost shell.
Option 'C' is incorrect.
K or Potassium is the element with the atomic number 19.
Electronic configuration of Potassium:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
The outermost shell of Potassium has 1 electron in 4s orbital.
Therefore, Potassium has a total of 1 electron in the outermost shell.
Option 'D' is incorrect.
Conclusion:
The ion with 18 electrons in the outermost shell is not Cs, K, or Th4.
The only option left is 'A', which is Copper (Cu).
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An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer?.
An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ion has 18 electrons in the outermost shell, it is[1990]a)Cu+b)Th4+c)Cs+d)K+Correct answer is option 'A'. Can you explain this answer?.
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