Q. What is the electron configuration of a neutral atom of sulfur (S)?
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A.
[Ne] 3s2 3p4
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B.
[He] 2s2 2p6 3s2 3p4
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C.
[Ar] 4s2 3d10 4p4
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D.
[Ne] 3s2 3p6
Solution
Sulfur has 16 electrons, and its electron configuration is [Ne] 3s2 3p4.
Correct Answer:
A
— [Ne] 3s2 3p4
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Q. What is the electron configuration of the ion Fe3+?
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A.
[Ar] 4s2 3d5
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B.
[Ar] 3d5
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C.
[Ar] 4s2 3d3
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D.
[Ar] 3d6
Solution
Iron (Fe) has an atomic number of 26, and the electron configuration for Fe3+ is [Ar] 3d5 after losing 3 electrons.
Correct Answer:
B
— [Ar] 3d5
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Q. What is the principal quantum number for the outermost electrons in potassium (K)?
Solution
Potassium has an atomic number of 19, and its outermost electrons are in the 4th shell (n=4).
Correct Answer:
B
— 4
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Q. Which quantum number describes the shape of an atomic orbital?
-
A.
Principal quantum number (n)
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B.
Azimuthal quantum number (l)
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C.
Magnetic quantum number (m_l)
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D.
Spin quantum number (m_s)
Solution
The azimuthal quantum number (l) determines the shape of the orbital, with values ranging from 0 to n-1.
Correct Answer:
B
— Azimuthal quantum number (l)
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