Electron Configuration

What is the Aufbau Principle?

• Electrons fill orbitals randomly without any order.
• The Aufbau Principle states that all electrons occupy the same energy level.
• The Aufbau Principle is a rule that electrons fill atomic orbitals in order of increasing energy.
• Electrons fill orbitals in order of decreasing energy.

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NGSS.HS-PS1-1

What is the Pauli Exclusion Principle?

• A single orbital can only hold one electron

• That a single orbital can hold a maximum of two electrons with opposite spins. 

• That a single orbital can hold a maxiumum of 9 electrons

• Orbitals dont fit any electrons

What is Hund's Rule?

• Electrons occupy the lowest energy orbitals first without regard to pairing.
• Electrons pair up in the same orbital before filling others.
• Electrons fill all orbitals before any pairing occurs.
• • When filling a subshell with electrons, each orbital within that subshell must be occupied singly (with the same spin) before pairing begins. 

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which one of these follows Hund's rule?

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NGSS.HS-PS1-1

Which one correctly demonstrates Pauli Exclusion principle?

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Draw the orbital diagram with the up-spin and down-spin electrons for an oxygen atom.

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NGSS.HS-PS1-1

Select the noble gas configuration for the element Polonium.

(Noble gas notation uses the noble gases as a shortcut)

(For example: [Kr] is shortcut for 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶)

• [Kr] 5s² 4d¹⁰ 5p⁴
• [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p⁴

• [Rn] 6s² 4f¹⁴ 5d¹⁰ 6p⁶
• [He] 6s² 4f¹⁴ 5d¹⁰ 6p²

Tags

NGSS.HS-PS1-1

Match the noble gas configuration to what they stand for.

• 1s²2s²2p⁶3s²3p⁶ 4s²3d¹⁰4p⁶4d¹⁰5s²5p⁶

• [Ar]

• 1s²

• [Xe]

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

• [Kr]

• 1s² 2s² 2p⁶ 3s² 3p⁶

• [Ne]

• 1s² 2s² 2p⁶

• [He]

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NGSS.HS-PS1-1

Reorder the following elements from having the shortest electron configuration (1) to the longest electron configuration (5)

• Lead

• Hydrogen

• Molybdenum

• Tin

• Beryllium

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NGSS.HS-PS1-1

Which of the following elements has the electron configuration [Ar] 4s² 3d¹⁰ 4p⁶?

• Krypton

• Argon

• Calcium

• Zinc

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2