*Its All about Pj Problem Strings -
7 Spaces Of Interest and their associated Basic Sequences; 7 Pj Problems of Interest (PPI) and their Alleles (A)*

The *Eletron Configuration Table* presents a detailed information about the *residencies* of the electrons of the elements of the Periodic Table. *Quantum wave mechanics* is the theory that established the *Electron Configuration Table*. Basically, the theory explains the behaviour of subatomic particles like the electrons of atoms and in particular, their residences and motions. Niels Bohr, De Broglie, Werner Heisenberg, Erwin Schrodinger and Paul Dirac were primary developers of the theory.

Quantum wave mechanics posits that there are three regions around the nucleus of an atom that electrons are most likely to reside: *shell*, *subshell* and *orbitals*. A shell is also called the principal quantum number or energy-level of an atom. It is usually denoted by the letter *n*. For example, *n = 1* implies the first shell (shell or energy-level nearest the nucleus of the atom); *n = 2* implies the second shell and so on. Energy increases with increasing *n*. There are *n* subshells in the *nth* shell. The first subshell is called the *s* subshell, the second is called the *p* subshell, the third is called the *d* subshell, the fourth is called the *f* subshell, the fifth the *g* subshell and so on. There are *n ^{2}* orbitals in the

*nx ^{y}*
where

The distribution of an atom's electrons in their respective orbitals is called the *electron configuration* of the atom. The *electron configuration* of an atom is usually expressed in an *Electron Configuration Table *. The following is the *Electron Configuration Table* for *gold*:

*1s ^{2}
2s^{2} 2p^{6}
3s^{2} 3p^{6} 3d^{10}
4s^{2} 4p^{6} 4d^{10} 4f^{14}
5s^{2} 5p^{6} 5d^{10}
6s^{1}*

The rule for electron *containership* in an orbital is given by *Pauli exclusion principle*: an orbital can hold no more than two electrons and the electrons must be of opposite spin (orientation in magntic field).

The description of the *motions* of electrons within their orbitals is given by *Heisenberg uncertainty principle*: it is impossible to know exactly both the position and momentum of an electron at the same instant.

The *interactions* of atoms occur when atoms share, or donate, or accept valence electrons. In general, the period of an atom equals its number of shells *n* and its group (Roman numeral) equals the number of electrons in its valence-shell.

The general form of the valence-shell configuration is:

*ns ^{a}np^{b}*
. Where n=is the period of the atom and a + b = number of electrons in its valence-shell. For example, I (Iodine) is at period 5 and group VIIA of the periodic table. So, n = 5 and a + b = 7. Therefore, its valence-shell configuration is: