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Questions and Answers
Which element does not follow the Aufbau principle due to the low energy gap between orbitals?
Which element does not follow the Aufbau principle due to the low energy gap between orbitals?
Which element has the electron configuration [Kr] 4d5 5s1?
Which element has the electron configuration [Kr] 4d5 5s1?
Which element follows the Aufbau principle?
Which element follows the Aufbau principle?
Among the listed elements, which one has the highest atomic number?
Among the listed elements, which one has the highest atomic number?
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Which element has the electron configuration [Ar] 3d8 4s1?
Which element has the electron configuration [Ar] 3d8 4s1?
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Study Notes
Aufbau Principle and Electron Configuration
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Exceptions to the Aufbau Principle: Chromium (Cr) is an element that does not follow this principle because of the low energy gap between the 3d and 4s orbitals, leading to a configuration of [Ar] 3d5 4s1 instead of filling the 4s orbital before the 3d.
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Electron Configuration [Kr] 4d5 5s1: Molybdenum (Mo) has this electron configuration, indicating it has 5 electrons in the 4d subshell and 1 in the 5s subshell.
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Element Following the Aufbau Principle: Gallium (Ga) follows the Aufbau principle, with a typical configuration arrangement where the lower energy orbitals are filled first, specifically [Ar] 4s2 3d10 4p1.
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Element with Highest Atomic Number: Among the elements discussed, Molybdenum (Mo) has the highest atomic number, which is 42.
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Electron Configuration [Ar] 3d8 4s1: Nickel (Ni) has this electron configuration, signifying it has 8 electrons in the 3d subshell and 1 in the 4s subshell, completing the 3d subshell before filling the 4s.
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Description
Test your knowledge on the electronic configurations of transition elements such as Scandium, Titanium, Iron, Copper, and more. Identify the correct electronic configurations based on the atomic numbers provided.
