Unit 04 Review - Electrons - 3 Electron Configs - 531

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What is the Aufbau principle?

Back

The Aufbau principle states that electrons occupy the lowest energy orbitals first before filling higher energy orbitals.

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What is the Pauli exclusion principle?

Back

The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers, meaning that electrons paired in an atomic orbital must have opposite spins.

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What is Hund's rule?

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Hund's rule states that orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all singly occupied orbitals have the same spin.

Front

How many unpaired electrons does sulfur have in its ground state configuration?

Back

Sulfur has 2 unpaired electrons in its ground state configuration (1s² 2s² 2p⁶ 3s² 3p⁴).

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What is the electron configuration for a neutral sulfur atom?

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The electron configuration for a neutral sulfur atom is 1s² 2s² 2p⁶ 3s² 3p⁴.

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What is the significance of electron configurations in chemistry?

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Electron configurations determine the chemical properties of an element, including its reactivity, bonding behavior, and placement in the periodic table.

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What does it mean for an electron to be unpaired?

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An unpaired electron is an electron that is alone in an orbital and not paired with another electron, which can affect the atom's magnetic properties.

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How does the Aufbau principle relate to the periodic table?

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The Aufbau principle helps explain the arrangement of elements in the periodic table based on their electron configurations, with elements in the same group having similar configurations.

Front

What happens if the Aufbau principle is violated in an electron configuration?

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If the Aufbau principle is violated, the electron configuration may not accurately represent the energy levels of the electrons, leading to incorrect predictions about the atom's behavior.

Front

Can you give an example of an electron configuration that violates the Pauli exclusion principle?

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An example would be an electron configuration where two electrons in the same orbital have the same spin, such as 1s² with both electrons having spin up.