MB2 10th Grade DT 1

What does the electron configuration of an element describe?

• The number of protons in the nucleus

• The distribution of electrons in atomic orbitals

• The number of neutrons in the nucleus

• The arrangement of atoms in a molecule

Which subshell can accommodate a maximum of 10 electrons?

• s subshell

• p subshell

• d subshell

• f subshell

What is the electron configuration of sodium?

• 1s²2s²2p⁶3s¹

• 1s²2s²2p⁶

• [Ne]3s¹

• [He]2s²2p⁶

Which principle states that electrons occupy lower energy orbitals before higher energy orbitals?

• Aufbau principle

• Pauli exclusion principle

• Hund's rule

• Bohr's principle

What is the electron configuration of oxygen?

• 1s² 2s² 2p⁴

• 1s²2s²2p⁶

• [Ne]3s²3p⁵

• [Ar]3d¹⁰4s²4p⁶

What is the maximum number of electrons that can be accommodated in the d subshell?

• 2

• 6

• 10

• 14

What is the electron configuration of chlorine?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁴

• [Ne] 3s² 3p⁵

• [Ar] 3d¹⁰ 4s² 4p⁶

Which principle states that every orbital in a subshell is singly occupied before a second electron is filled in an orbital?

• Aufbau principle

• Pauli exclusion principle

• Hund's rule

• Bohr's principle