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Question
Which atom is indicated by the following configuration?
[Ar] 4s2 3d1.
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Solution
[Ar] 4s2 3d1
The electronic configuration of the element is [Ar] 4s2 3d1= 1s2 2s2 2p6 3s2 3p6 4s23d1.
∴ Atomic number of the element = 21
Hence, the element with the electronic configuration [Ar] 4s2 3d1 is scandium (Sc).
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