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AP Intermediate 1st Year Structure of Atom — practice questions — page 3

Explore 86 free Structure of Atom questions in AP Intermediate 1st Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Structure of Atom questions and exercises with answers

Showing questions 61–86 of 86.

As per your syllabus, a species with 18 electrons, 16 protons, and 16 neutrons has what symbol?Read the answer and worked solution →As per your syllabus, in Rutherford's α-scattering on a gold foil, approximately how many α-particles bounced back through nearly 180°?Read the answer and worked solution →As per your syllabus, the radius of the first Bohr orbit of hydrogen (n = 1) — the Bohr radius a₀ — is approximately which value?Read the answer and worked solution →As per your syllabus, what is the energy of the first orbit of He⁺ (Z = 2, n = 1)?Read the answer and worked solution →As per your syllabus, eqn 2.15, the radius of the n-th Bohr orbit for a hydrogen-like ion (one electron, atomic number Z) scales as which expression?Read the answer and worked solution →As per your syllabus, in the hydrogen-atom spectrum the BALMER series corresponds to transitions ending in n₁ = 2 and lies in which spectral region?Read the answer and worked solution →As per your syllabus, eqn 2.9, the Rydberg formula for all spectral lines in hydrogen uses a constant value of approximately which figure?Read the answer and worked solution →As per your syllabus, eqn 2.5, the relation between the frequency ν, wavelength λ, and the speed of light c in vacuum is which equation?Read the answer and worked solution →As per your syllabus, what is the energy of one mole of photons of radiation of frequency 5 × 10¹⁴ Hz?Read the answer and worked solution →As per your syllabus, the LYMAN series (n₁ = 1) of hydrogen lines lies in which spectral region?Read the answer and worked solution →As per your syllabus, eqn 2.22, the de Broglie wavelength λ of a particle of momentum p (or mass m, velocity v) is which expression?Read the answer and worked solution →As per your syllabus, the magnetic quantum number m_l takes how many values for a given azimuthal quantum number l?Read the answer and worked solution →As per your syllabus, for n = 3 the TOTAL number of orbitals is which value?Read the answer and worked solution →As per your syllabus, the electron-spin quantum number m_s — introduced by Uhlenbeck and Goudsmit (1925) — takes which values?Read the answer and worked solution →As per your syllabus, the TOTAL number of nodes in an orbital (radial + angular) is given by which formula?Read the answer and worked solution →A 3p orbital is specified by:Read the answer and worked solution →The shape of a p-orbital is best described as:Read the answer and worked solution →Isotopes have the SAME number of:Read the answer and worked solution →The energy of the nth orbit in a hydrogen atom (Bohr's model) is:Read the answer and worked solution →The de Broglie wavelength of a particle with momentum p is:Read the answer and worked solution →Heisenberg's uncertainty principle is most accurately stated as:Read the answer and worked solution →Hund's rule states that electrons in degenerate orbitals:Read the answer and worked solution →By the AUFBAU principle, the 3d subshell starts filling:Read the answer and worked solution →The electronic configuration of Cr (Z=24) is an exception, written as:Read the answer and worked solution →In the photoelectric effect, the kinetic energy of ejected electrons is:Read the answer and worked solution →NEET · Chemistry · Quantum NumbersRead the answer and worked solution →

Worked practice questions

As per your syllabus, a species with 18 electrons, 16 protons, and 16 neutrons has what symbol?

  1. ³²₁₆S²⁻
  2. ¹⁶₈O
  3. ³²₁₆S
  4. ³⁴₁₈Ar
Show answer and solution

Correct answer: A. ³²₁₆S²⁻

As per your syllabus, Z = 16 ⇒ S; A = 16 + 16 = 32 18 e − 16 p = 2 extra electrons ⇒ charge −2 ⇒ ³²₁₆S²⁻.

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As per your syllabus, in Rutherford's α-scattering on a gold foil, approximately how many α-particles bounced back through nearly 180°?

  1. About 1 in 20,000
  2. About 1 in 2
  3. All of them
  4. None
Show answer and solution

Correct answer: A. About 1 in 20,000

As per your syllabus, ~1 in 20,000 α-particles bounced back by ~180° — the unexpected result that revealed the dense nucleus.

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As per your syllabus, the radius of the first Bohr orbit of hydrogen (n = 1) — the Bohr radius a₀ — is approximately which value?

  1. 52.9 pm
  2. 5.29 pm
  3. 529 nm
  4. 529 pm
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Correct answer: A. 52.9 pm

As per your syllabus, eqn 2.12, r_n = n² a₀ with a₀ = 52.9 pm. For n = 1, r = 52.9 pm.

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