#energy levels

Shapes of Orbitals - s p d f and Nodes and Radial Probability

The number of spectral lines produced when an electron falls from n = 9 to n = 6 in a hydrogen atom is:

Number of lines = (9-6)(9-6+1)/2 = 6.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability

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Shapes of Orbitals - s p d f and Nodes and Radial Probability

How many spectral lines are observed when an electron falls from n = 6 to n = 3 in a hydrogen atom?

Number of lines = (n₂-n₁)(n₂-n₁+1)/2 = 6.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability

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Quantum Numbers - Principal Azimuthal Magnetic Spin

Which of the following transitions in a hydrogen atom emits light of the shortest wavelength?

Shortest wavelength (highest energy) for n=5 to n=1.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Numbers - Principal Azimuthal Magnetic Spin

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Quantum Numbers - Principal Azimuthal Magnetic Spin

The ionization energy of H is 13.6 eV. What is the energy required to excite an electron in He⁺ from n = 2 to n = 4?

E₂ = -13.6 eV, E₄ = -3.4 eV for He⁺. ΔE = 10.2 eV.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Numbers - Principal Azimuthal Magnetic Spin

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Electronic Configuration - Aufbau Pauli Hund and Stability

The ionization energy of Li²⁺ is 122.4 eV. What is the energy required to excite an electron from n = 3 to n = 6?

E₃ = -13.6 eV, E₆ = -3.4 eV. ΔE = 10.2 eV.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

The energy required to excite an electron from n = 2 to n = 5 in a hydrogen atom is 4.896 × 10⁻¹⁹ J. What is the wavelen

λ = hc/ΔE ≈ 406.1 nm.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

The energy of an electron in the first orbit of He⁺ is -54.4 eV. What is the wavelength of the photon emitted when the e

ΔE = 10.2 eV. λ = hc/ΔE ≈ 121.7 nm.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

How many subshells are present in the n = 4 energy level?

Number of subshells = n = 4 (s, p, d, f).

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

The number of spectral lines produced when an electron falls from n = 7 to n = 3 in a hydrogen atom is:

Number of lines = (7-3)(7-3+1)/2 = 10.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

An electron jumps from n = 4 to n = 1 in a hydrogen atom. What is the energy of the emitted photon? (E₁ = -2.18 × 10⁻¹⁸

ΔE = |E₁|(1 - 1/16) = 2.04375×10⁻¹⁸ J.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

The ionization energy of a hydrogen atom is 13.6 eV. What is the wavelength of the photon emitted when an electron in C⁵

For C⁵⁺ (Z=6), ΔE = 91.8 eV. λ = hc/ΔE ≈ 13.53 nm.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

The energy of an electron in the first orbit of Li²⁺ is -122.4 eV. What is the ionization energy from the third orbit? (

E₃ = -122.4/9 = -13.6 eV. Ionization energy = 13.6 eV.

Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum

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