Textbook Question
Determine the number of protons and the number of electrons in each ion. b. Se2-
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Ch.2 - Atoms & Elements
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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Table of contents
- Ch.1 - Matter, Measurement & Problem Solving107
- Ch.2 - Atoms & Elements100
- Ch.3 - Molecules, Compounds & Chemical Equations127
- Ch.4 - Chemical Quantities & Aqueous Reactions114
- Ch.5 - Gases103
- Ch.6 - Thermochemistry92
- Ch.7 - Quantum-Mechanical Model of the Atom50
- Ch.8 - Periodic Properties of the Elements89
- Ch.9 - Chemical Bonding I: The Lewis Model84
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory74
- Ch.11 - Liquids, Solids & Intermolecular Forces60
- Ch.12 - Solids and Modern Material50
- Ch.13 - Solutions90
- Ch.14 - Chemical Kinetics111
- Ch.15 - Chemical Equilibrium65
- Ch.16 - Acids and Bases135
- Ch.17 - Aqueous Ionic Equilibrium145
- Ch.18 - Free Energy and Thermodynamics92
- Ch.19 - Electrochemistry100
- Ch.20 - Radioactivity and Nuclear Chemistry68
- Ch.21 - Organic Chemistry121
Chapter 2, Problem 58d
Determine the number of protons and the number of electrons in each ion. d. Sr2+
Verified step by step guidance1
Identify the atomic number of the element Sr (Strontium) from the periodic table, which is 38.
The atomic number represents the number of protons in a neutral atom, so Sr has 38 protons.
For a neutral atom, the number of electrons equals the number of protons. Therefore, a neutral Sr atom also has 38 electrons.
The ion Sr^{2+} indicates that the strontium atom has lost 2 electrons.
Subtract 2 from the original number of electrons (38) to find the number of electrons in Sr^{2+}, which is 36.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Atomic Structure
Atoms consist of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, while electrons are negatively charged and orbit the nucleus. The number of protons defines the element, and in a neutral atom, the number of electrons equals the number of protons.
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02:10
Atom Structure
Ions
Ions are atoms or molecules that have gained or lost one or more electrons, resulting in a net charge. A cation, like Sr2+, has lost electrons, leading to a positive charge. The charge of the ion indicates how many electrons have been lost or gained compared to the neutral atom.
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06:17Ion Formation
Strontium (Sr) Properties
Strontium is an alkaline earth metal with an atomic number of 38, meaning it has 38 protons in its neutral state. When it forms the Sr2+ ion, it loses two electrons, resulting in a total of 36 electrons. Understanding the properties of strontium helps in determining the electron configuration and charge of its ions.
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02:54Physical Properties
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