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Scandium has 1 3d electron.
The element with one 3d electron is manganese (Mn), which has the electron configuration [Ar] 3d^5 4s^2.
The electron configuration for scandium is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1. Therefore, the three highest-energy electrons in scandium are in the 3d orbital, and the electron notation for these three electrons is 3d^1.
Potassium (K) is atomic number 19. It has 19 electrons.1s2 2s2 2p6 3s2 3p6 4s1 so it has ZERO 3d electrons. The 3d doesn't receive electrons until you reach scandium (atomic number 21).
Electronic configuration of scandium: [Ar]3d1.4s2
Scandium has 1 3d electron.
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The element with one 3d electron is manganese (Mn), which has the electron configuration [Ar] 3d^5 4s^2.
The electron configuration for scandium is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1. Therefore, the three highest-energy electrons in scandium are in the 3d orbital, and the electron notation for these three electrons is 3d^1.
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Scandium (Sc) has an atomic number of 21, which means it has 21 electrons. Its electron configuration is [Ar] 3d¹ 4s². In this configuration, there is one unpaired electron in the 3d subshell, as the 4s subshell is fully paired. Therefore, scandium has one unpaired electron.
The first element that has enough electrons to begin placing in the 3d sublevel is scandium (Sc), which has an atomic number of 21. In its electron configuration, scandium is represented as [Ar] 3d¹ 4s², indicating that the 3d sublevel starts to fill after the 4s sublevel.
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Potassium (K) is atomic number 19. It has 19 electrons.1s2 2s2 2p6 3s2 3p6 4s1 so it has ZERO 3d electrons. The 3d doesn't receive electrons until you reach scandium (atomic number 21).
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Electronic configuration of scandium: [Ar]3d1.4s2
Scandium has four electronic shells with 2, 8, 9, 2 electrons.