Review of Chapters 4 & 5

Which of the following best describes orbitals?

• Definite tracks followed by electrons

• Areas where electrons are most probably located

• Waves of energy from the nucleus

• Objects traveling at nearly light speed

Which of the following lists correctly identifies the names of the atomic sublevels?

• s, p, d, f

• A, B, C, D

• Sublevel 1, 2, 3, 4

• Alpha, Beta, Gamma, Delta

Which rule explains that electrons occupy all the orbitals of a given sublevel singly before any orbital is doubly occupied?

• Aufbau Principle

• Hund's Rule

• Pauli Exclusion Principle

• Heisenberg Uncertainty Principle

Phosphorus (atomic # 15) has which of the following electron configurations?

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 2, 8, 5

• 1s² 2s² 2p⁶ 3s² 3p²

The image shows the electron configuration for xenon.

• TRUE

• FALSE

Answer explanation

This is the electron configuration for Krypton. :-)

Which of the following represents the correct noble gas shorthand for the electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶5s² ?

• [He] 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶5s²

• [Ne] 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶5s²

• [Ar] 5s²

• [Sr] 5s²

The 4 electrons in the outermost sublevel of SELENIUM are in the 4p sublevel. Which image correctly represents the orbital notation for selenium's 4p sublevel?

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Nitrogen's orbital notation is. . .

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Scandium’s (atomic # 21) orbital notation is. . .

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An atom contains 17 protons, 20 neutrons, and 17 electrons. What is the atomic number of this atom?

• 17

• 20

• 37

• 34