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Chem Chap 4 Sec 3
Electron Configurations
Question | Answer |
---|---|
The arrangement of electrons in an atom is known as | the atom’s electron configuration |
The lowest energy arrangement of the electrons for each element is called | the element’s ground-state electron configuration |
What principle states that an electron occupies the lowest-energy orbital that can receive it | Aufbau principle |
no two electrons in the same atom can have the same set of four quantum numbers is what principle | Pauli exclusion principle |
The Pauli Exclusion principal,angular momentum, and magnetic quantum numbers specify what | the energy, shape, and orientation of an orbital |
Whose rule says orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin state. | Hund’s rule |
In orbital notation, an unoccupied orbital is represented by | a line, , with the orbital’s name written underneath the line |
An orbital containing one electron is represented as | ↑ |
An orbital containing two electrons is represented as | ↑↓ |
The lines are labeled with the principal quantum number and | sublevel letter. |
How is the Electron-configuration notation different form orbital notation | eliminates the lines and arrows of orbital notation. Instead, the number of electrons in a sublevel is shown by adding a superscript to the sublevel designation |
What does the superscript indicate | The superscript indicates that one electron is present |
The highest-occupied energy level is | the electron-containing main energy level with the highest principal quantum number |
electrons that are not in the highest-occupied energy level. | inner-shell electrons |
The Group 18 elements are called the | noble gases. |
Name the Group 18 elements | helium, neon, argon, krypton, xenon, and radon |
an outer main energy level occupied, in most cases, by eight electrons | noble-gas configuration |
The arrangement of electrons in an atom is | Electron configuration |
The lowest-energy arrangement of the electrons for each element | Ground-state electron configuration |
The electron containing main energy level with the highest principle quantum number | Highest occupied energy level |