CPC 4.3 Electron Configuration

Multiple Select

Which are true of electrons?

(Choose all correct answers)

• surrounds nucleus

• no charge

• Fast-moving

• very small mass

• no mass

Multiple Choice

The Aufbau principle states that each electron wants to occupy the ______ energy orbital available.

• highest

• lowest

• closest

• furthest

Multiple Choice

What do the arrows indicate inside the boxes?

• direction of electron spin

• direction electrons travel

• north and south

• up and down

Multiple Choice

According to the Pauli exclusion principle, how many electrons can occupy a single orbital?

• One

• Two

• Three

• Four

Multiple Choice

What condition must be met for two electrons to occupy the same orbital according to the Pauli exclusion principle?

• They must have the same spin.

• They must have opposite spins.

• They must be in different energy levels.

• They must be in the same energy level.

Multiple Choice

Which of the following is obeying the Pauli exclusion principle?

Multiple Select

Which of these is obeying Hund's rule about electron configuration?

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Multiple Choice

The main concept of Hund's rule in electron configuration is that ____________ must occupy equal energy orbitals before pairing.

• electrons surrounding the nucleus

• electrons with opposite spin

• electrons with the same spin

• electrons inside the nucleus

Multiple Choice

In the context of Hund's rule, what is meant by 'equal-energy orbital'?

• Orbitals that have different energy levels.

• Orbitals with the same principal quantum number

  (1, 2, 3, ...)

• Orbitals with the same number and letter

  (1s, 2s, 2p, ...)

• Orbitals that are empty.

Multiple Choice

Which of the following diagrams correctly shows the electron configuration of Sulfur?

• A

• B

• C

• D

Multiple Choice

What is the electron configuration notation for SULFUR

• 1s² 2s² 2p⁶ 3s² 3p⁴

• 1s² 1s² 2p⁶ 3s² 3p²

• 1s² 2s² 2p³ 3s² 3p⁴

• 1s² 2s² 2p⁶ 2s⁴ 3p³²

Multiple Choice

What is the electron configuration notation for OXYGEN?

• 1s² 2s² 2p⁴

• 1s² 1s² 2p⁴

• 2s² 2s² 2p⁴

• 1s² 2s² 5p⁴

Multiple Choice

What is the electron configuration notation for NEON?

• 1s² 2s² 2p⁶

• 1s² 2s⁴ 2p⁴

• 1s² 2s² 3s² 4s² 5s²

• 1s² 2s² 3p⁶

Multiple Choice

What do electron-dot structures represent?

• The atomic mass

• The valence electrons

• The number of protons

• The atomic number

Multiple Choice

What determines an element's chemical properties?

• The number of protons

• The valence electrons

• The atomic mass

• The number of neutrons

Multiple Choice

Which of these is correct?

Multiple Select

Which of these is correct?

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Multiple Select

Which ones are acceptable for #13 Aluminum in Group 3A?

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Multiple Select

Nitrogen is in column 15 or Group 5A. Which of the following is the correct electron dot structure for nitrogen?

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Multiple Select

Beryllium (Be) is in Group 2A. Which of the following are correct electron dot structures for Be?

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Multiple Choice

What does the aufbau principle state?

• A maximum of two electrons can occupy a single atomic orbital.

• Each electron occupies the highest energy orbital available.

• Each electron occupies the lowest energy orbital available.

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

Multiple Choice

Which of the following is the electron configuration of helium?

• 1s¹

• 1s²

• 1p¹

• 1s²2s²2p⁶

Multiple Choice

Which of the following is true?

• Valence electrons do not determine chemical properties.

• Valence electrons are in an atom’s innermost orbital.

• Valence electrons are associated with the highest energy level.

• Valence electrons are not involved in forming chemical bonds.

Multiple Choice

The electron configuration of ground state carbon is 1s²2s²2p².

How many electrons are in the third p orbital?

• 1

• 2

• 4

• 0