Electron configuration and orbital diagram review

What is the electron configuration of oxygen (O)?

• 1s² 2s² 2p⁴
• 1s² 2s² 2p²
• 1s² 2s² 2p³
• 1s² 2s² 2p⁵

Tags

NGSS.HS-PS1-1

Which element has the electron configuration [Kr] 5s² 4d¹⁰ 5p⁵?

• Iodine (I)
• Astatine (At)
• Bromine (Br)
• Xenon (Xe)

Tags

NGSS.HS-PS1-1

What is the maximum number of electrons that can occupy the n=3 shell?

• 18.0
• 8.0
• 32.0
• 2.0

Which of the following represents an incorrect electron configuration?

• 1s² 2s²
• 1s² 2s² 2p⁶
• 1s² 2s² 3p⁶
• 1s² 2s² 2p⁵

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

For the element with atomic number 11 (sodium), what is its electron configuration?

• 1s² 2s² 2p⁶ 3s¹
• 1s² 2s² 2p⁶ 3p¹
• 1s² 2s² 3s²
• 1s² 2s¹ 2p⁶ 3s¹

Tags

NGSS.HS-PS1-1

What is the electron configuration for the element with atomic number 26 (iron)?

• [Ar] 4s² 3d⁶
• [Ar] 3s² 3p⁶ 3d⁶
• [Kr] 5s² 4d⁶
• [Ne] 3s² 3p⁶ 4s²

Tags

NGSS.HS-PS1-1

According to the Aufbau principle, which orbital is filled after 4s?

• 3d
• 4p
• 4s
• 5s

What is Hund's rule?

• Electrons fill orbitals singly before pairing
• Electrons fill from low to high energy
• Electrons occupy the lowest energy level first
• Orbitals cannot hold more than two electrons

How many electrons can a single orbital hold?

• 2.0
• 6.0
• 8.0
• 4.0

Which of the following is the correct order of filling for the d-block elements?

• 3d, 4s, 4p
• 4p, 4s, 3d
• 3p, 4s, 3d