Electron Configurations & Valence Electrons

What does the Pauli exclusion principle state about electron occupancy in an orbital?

• Only one electron can occupy an orbital.

• A maximum of two electrons can occupy an orbital, but only if they have opposite spins.

• Two electrons can occupy an orbital with the same spin.

• Electrons can occupy any orbital without restriction.

Fill in the blank: In the correct electron configuration for helium, the spins are represented by arrows pointing ______.

• both up

• both down

• in opposite directions

• in the same direction

What does Hund's rule state about electron configuration?

• Electrons must pair up in each orbital before moving to the next.

• Single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same energy level orbitals.

• Electrons must fill the lowest energy orbitals first.

• Electrons must have opposite spins in the same orbital.

What is the electron configuration of oxygen?

• 1s² 2s² 2p⁴

• 1s² 2s² 2p³

• 1s² 2s¹ 2p⁵

• 1s² 2s² 2p⁶

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Fill in the blank: In the orbital diagram for oxygen, the 2p orbitals contain ___ electrons.

• 2

• 4

• 6

• 3

Which element has the electron configuration notation 1s² 2s² 2p⁶?

• Helium

• Neon

• Oxygen

• Carbon

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Fill in the blank: The electron configuration notation for Carbon is 1s² 2s² ____. A) 2p¹ B) 2p² C) 2p³ D) 2p⁴.

• 2p¹

• 2p²

• 2p³

• 2p⁴

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What is the electron configuration of Magnesium using noble gas notation?

• [Ne]3s1

• [Ne]3s2

• [Ar]3s2

• [Ne]3p1

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Fill in the blank: The electron configuration of Sulfur using noble gas notation is [Ne]3s2___.

• 3p1

• 3p2

• 3p4

• 3p5

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NGSS.HS-PS1-1

What are valence electrons?

• Electrons in the innermost orbitals

• Electrons in the outermost orbitals

• Electrons in the nucleus

• Electrons in the middle orbitals.

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