Questions and Answers
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 follows the Aufbau principle?
Among the listed elements, which one has the highest atomic number?
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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.
