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Strings (SiPjAjk) = S7P6A64     Base Sequence = 12735     String Sequence = 12735 - 6 - 64



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Periodic Table Showing Sub-Shells That Are filling
Figure 9.16 shows the order in which the electrons of atoms fill their orbitals. Use this information to determine the electron configuration of the following elements:
(a) Iron (b) Aluminum (c) Bismuth

The string:
S7P6A64 (Grouping - Multi-Criteria Permutation).
The math:
Periodic Table Showing Sub-Shells That Are filling
Pj Problem of Interest is of type grouping. The grouping is ordered and the containership of the sub-shells are implied in the grouping.
The basic premise of electron residency in atomic orbitals is that the atom distributes its electrons in its orbitals so as to realized its lowest energy state. This is the reason why in period 4 (figure 9.16), the 4s sub-shell will be filled before the 3d sub-shell begins to be filled. In order words, the atoms potassium (K) and calcium (Ca) see the 4s sub-shell as a lower energy state than the 3d sub-shell.

(a) Atomic number of Iron = 26; period = 4; group = VIIIB.
So, The 3d sub-shell is filling.
So, fill all the sub-shells preceding the 3d sub-shell in period 4 (noting that s sub-shell has 1 orbital; p subshell has 3 orbitals; d subshell has 5 orbitals and f subshell has 7 orbitals. An orbital holds a maximum of 2 electrons). Then assign remaining electrons to the filling sub-shell.
So, electron configuration of iron = 1s22s22p63s23p64s23d6
We then rearrange in increasing order of sub-shells
So, electron configuration of iron = 1s22s22p63s23p63d64s2

(b) Atomic number of Aluminum = 13.
So, 3p sub-shell filling
So, electron configuration of aluminum = 1s22s22p63s23p1

(c) Atomic number of Bismuth = 83.
So, 6p sub-shell filling
So, electron configuration of Bismuth
= 1s22s22p63s23p6 4s23d104p65s24d105p66s24f145d106p3
Arranging in increasing sub-shell order:
Electron configuration of Bismuth
= 1s22s22p63s23p6 3d104s24p64d104f145s25p65d106s26p3

The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
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