How many electrons would you expect to find around an atom of scandium?

Scandium Z= 21 has an electronic configuration of  1s²2s²2p⁶3s²3p⁶3d¹4s². 
This shows that Scandium has 21 electrons with three outermost or valency electrons. It is a d-block elements whose valence electrons are equal to their group number, which is equal to the number of electrons in the valence shell. 

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