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Ch.6 - Electronic Structure of Atoms
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.6 - Electronic Structure of AtomsProblema 35
Capitolo 6, Problema 35

Does the hydrogen atom 'expand' or 'contract' when an electron is excited from the n = 1 state to the n = 3 state?

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Understand the concept of electron orbitals in a hydrogen atom. The principal quantum number, 'n', indicates the size and energy of the orbital where the electron resides.
Recognize that as the principal quantum number 'n' increases, the electron moves to a higher energy level, which is further away from the nucleus.
Relate the distance of the electron from the nucleus to the size of the electron cloud or orbital. A higher 'n' value means a larger orbital.
Conclude that when an electron is excited from a lower energy level (n = 1) to a higher energy level (n = 3), it moves to an orbital that is further from the nucleus.
Determine that the hydrogen atom 'expands' because the electron occupies a larger orbital when it is excited from the n = 1 state to the n = 3 state.

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Quantum States

Quantum states refer to the specific energy levels that electrons occupy in an atom. Each state is characterized by a principal quantum number (n), which indicates the energy level and distance from the nucleus. For hydrogen, the n = 1 state is the ground state, while n = 3 is an excited state, where the electron is further from the nucleus and has higher energy.
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Quantum Numbers

Electron Excitation

Electron excitation occurs when an electron absorbs energy and transitions from a lower energy level to a higher one. In the case of hydrogen, moving from n = 1 to n = 3 means the electron gains energy, which can be provided by various sources such as heat or light. This process results in the electron being in a less stable, higher energy state.
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Electron Geometry

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. When an electron is excited to a higher energy level, such as from n = 1 to n = 3, the average distance of the electron from the nucleus increases, effectively causing the atom to 'expand' in size due to the electron's higher energy state.
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Atomic Radius
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Domanda del libro di testo

Classify each of the following statements as either true or false: (a) A hydrogen atom in the n = 3 state can emit light at only two specific wavelengths (b) a hydrogen atom in the n = 2 state is at a lower energy than one in the n = 1 state (c) the energy of an emitted photon equals the energy difference of the two states involved in the emission.

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Domanda del libro di testo

Is energy emitted or absorbed when the following electronic transitions occur in hydrogen? a. from n = 4 to n = 2

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Domanda del libro di testo

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 * 1015 s - 1 before it can eject an electron from its surface via the photoelectric effect. (b) What wavelength of radiation will provide a photon of this energy?

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Domanda del libro di testo

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 * 1015 s - 1 before it can eject an electron from its surface via the photoelectric effect. (c) If molybdenum is irradiated with light of wavelength of 120 nm, what is the maximum possible kinetic energy of the emitted electrons?

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Domanda del libro di testo

Is energy emitted or absorbed when the following electronic transitions occur in hydrogen? b. from an orbit of radius 2.12 Å to one of radius 8.46 Å

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