Textbook Question
True or false? c. S2− is larger than K+.
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Ch.7 - Periodic Properties of the Elements
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 7, Problem 33a
Consider S, Cl, and K and their most common ions. (a) List the atoms in order of increasing size.
Verified step by step guidance1
Identify the most common ions for sulfur (S), chlorine (Cl), and potassium (K). Sulfur commonly forms S^2-, chlorine forms Cl^-, and potassium forms K^+.
Recall that cations (positively charged ions) are generally smaller than their neutral atoms due to loss of electrons which reduces electron-electron repulsion and allows the nucleus to pull the remaining electrons closer. Anions (negatively charged ions) are generally larger than their neutral atoms because the addition of electrons increases electron-electron repulsion, causing the electron cloud to expand.
Compare the charges of the ions: K^+ (a cation), Cl^- (an anion), and S^2- (an anion with a higher negative charge than Cl^-).
Understand that the size of ions increases as the magnitude of the negative charge increases. Therefore, among anions, those with higher negative charges are larger because they have more electrons for the same number of protons in the nucleus.
Arrange the ions in order of increasing size based on the above understanding: K^+ (smallest), Cl^-, S^2- (largest).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Atomic Radius
The atomic radius is a measure of the size of an atom, typically defined as the distance from the nucleus to the outermost electron shell. Atomic size generally increases down a group in the periodic table due to the addition of electron shells, while it decreases across a period from left to right due to increased nuclear charge, which pulls electrons closer to the nucleus.
Ionic Size
Ionic size refers to the size of an ion, which can differ significantly from the neutral atom. Cations (positively charged ions) are smaller than their parent atoms because they lose one or more electrons, reducing electron-electron repulsion and allowing the remaining electrons to be pulled closer to the nucleus. Conversely, anions (negatively charged ions) are larger than their parent atoms due to the addition of electrons, which increases repulsion among electrons.
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Periodic Trends
Periodic trends are patterns observed in the periodic table that describe how certain properties of elements change across periods and down groups. For atomic and ionic sizes, the trend shows that as you move from left to right across a period, the size decreases, while moving down a group increases the size. Understanding these trends is essential for predicting the relative sizes of atoms and their ions.
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Related Practice
Textbook Question
Arrange each of the following sets of atoms and ions in order of increasing size. Se2−,Te2−, Se
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Textbook Question
For each ion, identify the neutral atom that is isoelectronic with it.
a. Cl−
b. Sc3+
c. Fe2+
d. Zn2+
e.Sn4+
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Textbook Question
Consider the isoelectronic ions F- and Na+. (b) Using Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute 0.00 to the screening constant, S, calculate Zeff for the 2p electrons in both ions.
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Textbook Question
Consider S, Cl, and K and their most common ions. (b) List the ions in order of increasing size. (c) Explain any differences in the orders of the atomic and ionic sizes.
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