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Br [Ar] 4s 2 3d 10 4p 5. In Group 18 (8A; the noble gases) the p subshell has just been filled. Ar 1s 2 2s 2 2p 6 3s 2 3p 6. Transition Elements, the d-block elements In the d-block transition elements (transition metals) a d subshell is being filled. The principal quantum number of the d subshell is always 1 less than the period in which the ... · Continue to write remaining subshell after the noble gas core. An Example: Write electron configuration for potassium atom. Solution · The abbreviated electron configuration for potassium is: K: [Ar] 4s1. An Example: Write electron configurations for vanadium atom and vanadium ion (𝑉3+).One way of putting it is that an empty 4s orbital in Sc has a higher energy than an empty 3d orbital, but a filled 4s orbital has a lower energy than a filled 3d orbital. The fact that 4s > 3d in energy also explains why, for the transition metals, the 4s electrons are removed first upon ionisation (S c X +: [ A r] (3 d) 1 (4 s) 1.)