Electron configuration

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9 Terms

1

Ms

The spin quantum number, can have 2 values: +1/2 and -1/2. + is up and - is down.

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2

Pauli Exclusion Principle

No two electrons can have the same four quantum numbers. Results in a specific orbital having ONLY 2 electrons one with a + spin and - spin.

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3

Effective nuclear charge (Zeff)

The net charge experienced by an electron in a multi-electron atom, accounting for shielding by other electrons. It is calculated as the Zactual - Electron Shielding = Zeff

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4

Zeff and Energy of orbitals graph

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5

Electron configuration

A description of which orbitals in an atom are occupied by electrons

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6

Aufbau Principle

The principle that electrons fill atomic orbitals starting from the lowest energy level to the highest. This is used to determine the electron configuration of an atom.

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7

Ground-state electron configuration

The electron configuration of an atom in its lowest energy state, showing the distribution of electrons among the atomic orbitals.

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8

Degenerate

orbitals that have the same energy level.

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9

Hund’s rule

if two or more degenerate orbitals are available one electron goes in each until all are half full

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