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Electron Config.
Electron Configuration
Term | Definition |
---|---|
Electron Configuration | distribution of electrons among the orbitals of an atom |
Aufbau's Principle | States that an electron occupies orbitals in order from lowest energy to highest energy. |
Pauli Exclusion Principle | no two electrons in an atom or molecule have the same electronic quantum numbers |
Hund's Rule | every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin. |
Orbital Diagram | A diagram in which orbitals are represented by boxes grouped by sublevels with small arrows indicating the electrons. |
Valence Electrons | The electrons in the outermost principal energy level of an atom |
Core Electrons | The innermost electrons that are not involved in bonding atoms to each other. |
Noble Gas Notation | A noble gas configuration of an atom consists of the elemental symbol of the last noble gas prior to that atom, followed by the configuration of the remaining electrons. |
Aufbau Sequence | This sequence shows that electrons are filled into atomic orbitals in the increasing order of orbital energy level. |
S block | The s-block in the periodic table of elements occupies the alkali metals and alkaline earth metals, also known as groups 1 and 2 |
P block | The p-block contains groups 13, 14, 15, 16, 17, and 18, with the exception of Helium |
D block | The d-block elements are found in groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of the periodic table |
F block | F Block elements are located in the two rows underneath the main table. These 30 elements' valence electrons fall in the f sub-shell. |
Representative Elements | Elements in Groups 1, 2, 3, 4, 5, 6, 7, 8. Also called the main - group elements. |