The elements from scandium(Z=21) to zinc (Z=30) constitute the first transition series. In the first element, scandium, the 3d subshell starts filling up. Its electronic configuration is 1s22s2p63s2p6d14s2.
For reasons of space, we shall describe configurations of outer shells only, leaving aside the configuration up to 3p level (argon configuration) which remains the same throughout the period.
The outer electronic configuration of scandium may, thus, be written as 3d14s2.
The titanium (Z=22) has one more d electron added to it. Its outer electronic configuration is 3d24s2.
This procedure continues and the d orbitals get filled up more and more, step by step, on moveing towards the right along this period.
the outer electronic configurations of other elements are vanadium(Z=23), chromium (Z=24),manganese (Z=25), iron(Z=26), cobalt(Z=27), nickel(Z=28), copper(Z=29), zinc(Z=30).
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