Predict whether He2+ exists.

Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding

Bruice8th EditionOrganic ChemistryISBN: 9780135213711당신이 사용하는 게 아니라요?교과서 변경

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Bruice 8th Edition

Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding

문제 25

1장, 문제 25

Predict whether He₂⁺ exists.

검증된 단계별 안내

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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주요 개념

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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 He2+ would require a significant amount of energy. This high energy requirement makes the formation of He2+ less favorable.

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 (1s2), is already in a stable state. The removal of both electrons to form He2+ would lead to a highly unstable ion, as it would have no electrons to shield the nucleus, making it unlikely to exist.

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 1s2, 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 He2+ is unlikely to exist.