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Due to its functional architecture, ADOMAH Periodic Table provides the most convenient and
logical way to determine electron configurations of the atoms.
The ADOMAH PT, as a whole, reflects electron configuration of 120th element, just count number of elements in each column vertically and you will get 2-8-18-32-32-18-8-2.
Same thing can be done for any element with atomic number less than 120. Simply ignore all elements that have
greater atomic number than the element you selected and count remaining elements in each vertical column (straight
down).
For example, if you want to determine electron configuration for Er(68), cross out elements 69 through 120,
as shown on the diagram, and count number of remaining elements in each vertical column. You will get: 2-8-18-30-8-2. You can also
easily divide the elements in each column in order of subshells s, p, d and f (following the vertical columns in order of l=0,1,2,3):
1S2 2S2 2P6 3S2 3P6 3d10 4S2 4P6 4d10 4f12 5S2 5P6 6S2;
or in order of filling of the orbitals (following the cascades in order of l=3,2,1,0):
1S2 2S2 2P6 3S2 3P6 4S2 3d10 4P6 5S2 4d10 5P6 6S2 4f12.
This is so logical and simple ! Compare this with the standard or any other Periodic Table.
To start using this simple method of deriving electron configurations, print copy of the ADOMAH PT HERE.
Note: it should be remembered that there are 18 common exceptions to the general rule of filling f, d and s orbitals, see below:
Cr (..., 3d5, 4s1); Cu (..., 3d10, 4s1); Nb (..., 4d4, 5s1); Mo (..., 4d5, 5s1); Ru (..., 4d7, 5s1); Rh (..., 4d8, 5s1); Pd (..., 4d10, 5s0); Ag (..., 4d10, 5s1);
La (..., 5d1, 6s2); Ce (..., 4f1, 5d1, 6s2); Gd (..., 4f7, 5d1, 6s2); Au (..., 5d10, 6s1); Ac (..., 6d1, 7s2); Th (..., 6d2, 7s2); Pa (..., 5f2, 6d1, 7s2);
U (..., 5f3, 6d1, 7s2); Np (..., 5f4, 6d1, 7s2) and Cm (..., 5f7, 6d1, 7s2).
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