Textbook Question
(a) What are 'valence electrons'?
Ch.6 - Electronic Structure of Atoms
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 6, Problem 73
(d) What object is represented by the half arrows in an orbital diagram? What does the direction of the arrow signify?
Verified step by step guidance1
In an orbital diagram, the half arrows represent electrons. Each arrow corresponds to one electron within an orbital.
The direction of the arrow indicates the electron's spin. Electrons have a property called spin, which can be either 'up' or 'down'.
An upward-pointing arrow typically signifies an electron with a spin quantum number of +1/2, while a downward-pointing arrow signifies a spin quantum number of -1/2.
The Pauli Exclusion Principle states that no two electrons in the same atom can have identical sets of quantum numbers. Therefore, in a single orbital, one electron will have an 'up' spin and the other will have a 'down' spin.
Understanding the direction of the arrows helps in determining the electron configuration and the magnetic properties of the atom or molecule.
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Orbital Diagrams
Orbital diagrams are visual representations of the electron configuration of an atom. They illustrate the distribution of electrons among the various orbitals, which are regions of space where electrons are likely to be found. Each orbital can hold a maximum of two electrons, and the diagrams help in understanding how electrons fill these orbitals according to the principles of quantum mechanics.
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Electron Orbital Diagrams
Half Arrows in Orbital Diagrams
In orbital diagrams, half arrows represent individual electrons within the orbitals. Each arrow points either up or down, indicating the spin of the electron, which can be either 'up' (spin +1/2) or 'down' (spin -1/2). This notation is crucial for adhering to the Pauli Exclusion Principle, which states that no two electrons in an atom can have the same set of quantum numbers.
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Direction of the Arrow
The direction of the half arrow in an orbital diagram signifies the spin of the electron. An upward-pointing arrow represents an electron with a positive spin, while a downward-pointing arrow indicates a negative spin. This distinction is important for understanding the behavior of electrons in magnetic fields and their overall contribution to the atom's magnetic properties.
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Related Practice
Textbook Question
What is the maximum number of electrons that can occupy each of the following subshells? (a) 3s, (b) 2p, (c) 4d, (d) 5s.
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Textbook Question
What is the maximum number of electrons in an atom that can have the following quantum numbers? (a) n = 3, ml = -1; (b) n = 4, l = 2; (c) n = 4, l = 3, ml = -2; (d) n = 5, l = 2, ml = 0.
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Textbook Question
(c) What does each box in an orbital diagram represent?
Textbook Question
An experiment called the Stern–Gerlach experiment helped establish the existence of electron spin. In this experiment, a beam of silver atoms is passed through a magnetic field, which deflects half of the silver atoms in one direction and half in the opposite direction. The separation between the two beams increases as the strength of the magnetic field increases. (c) Would this experiment work for a beam of fluorine (F) atoms?
Textbook Question
(b) What are 'core electrons'?