Domanda del libro di testo
Which of the atoms in the molecular models in [Problem 20] have
<IMAGE>
a. three lone pairs?
b. two lone pairs?
c. one lone pair?
d. no lone pairs?
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Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 1 - Remembering General Chemistry: Electronic Structure and BondingProblema 25
Bruice 8th EditionCh. 1 - Remembering General Chemistry: Electronic Structure and BondingProblema 25Capitolo 1, Problema 25
Predict whether He2+ exists.
Guida verificata passo dopo passo1
Step 1: Understand the molecular orbital (MO) theory, which is used to predict the existence and stability of diatomic molecules. According to MO theory, the bonding and antibonding molecular orbitals are formed by the combination of atomic orbitals.
Step 2: Write the electronic configuration of helium (He). Helium has an atomic number of 2, so its electronic configuration is 1s². For He2+, one electron is removed, leaving a total of 3 electrons to distribute in molecular orbitals.
Step 3: Construct the molecular orbital diagram for He2+. The 1s orbitals of each helium atom combine to form a bonding molecular orbital (σ1s) and an antibonding molecular orbital (σ1s*).
Step 4: Fill the molecular orbitals with the 3 electrons, starting with the lowest energy orbital (σ1s). Place 2 electrons in the σ1s orbital and 1 electron in the σ1s* orbital, following the Aufbau principle and Hund's rule.
Step 5: Calculate the bond order using the formula: Bond Order = (Number of electrons in bonding orbitals - Number of electrons in antibonding orbitals) / 2. Use this bond order to determine whether He2+ is stable and can exist.
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Ionization Energy
Ionization energy is the energy required to remove an electron from an atom or ion. For helium, which has a high ionization energy due to its small size and effective nuclear charge, removing an electron to form He<sup>2+</sup> would require a significant amount of energy. This high energy requirement makes the formation of He<sup>2+</sup> less favorable.
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04:28
Ionization Potentials
Stability of Ions
The stability of ions is influenced by factors such as electron configuration and the effective nuclear charge. Helium, with its complete electron shell (1s<sup>2</sup>), is already in a stable state. The removal of both electrons to form He<sup>2+</sup> would lead to a highly unstable ion, as it would have no electrons to shield the nucleus, making it unlikely to exist.
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Percorso guidato
3:39Metal Ion Catalysis Concept 1
Quantum Mechanics and Electron Configuration
Quantum mechanics governs the behavior of electrons in atoms, including their arrangement and energy levels. Helium's electron configuration is 1s<sup>2</sup>, indicating two electrons in the lowest energy level. The principles of quantum mechanics suggest that removing both electrons would not only destabilize the atom but also violate the Pauli exclusion principle, further supporting the conclusion that He<sup>2+</sup> is unlikely to exist.
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04:12The Electron Configuration
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