This page covers AFCAT Atoms with complete concept notes, 18 graded practice MCQs, key points and exam-specific tips. Free to study.
18graded MCQs · easy to hard · full solution & trap analysis
According to Bohr's model of the hydrogen atom, the radius of the first orbit (Bohr radius) is approximately:
The energy of an electron in the second orbit (n=2) of a hydrogen atom is -3.4 eV. What is the energy of the electron in the first orbit (n=1)?
An electron transitions from the third orbit (n=3) to the second orbit (n=2) in a hydrogen atom. The energy of the emitted photon is:
Which of the following statements about the ground state of a hydrogen atom is correct?
The ionization energy of a hydrogen atom is the energy required to remove the electron from the first orbit. This value is:
Calculate the ionization energy of hydrogen (energy to remove electron from n=1 to n=∞).
Which spectral series corresponds to electron transitions ending at n=2 in a hydrogen atom?
An atom has electrons in orbitals with quantum numbers. What is the minimum number of electrons needed to fill the K and L shells completely?
In the Bohr model, the velocity of an electron in the nth orbit of hydrogen is proportional to which of the following?
An electron in a hydrogen atom transitions from n=3 to n=1. What is the energy released in this transition? (Use E_n = -13.6/n² eV)
According to Bohr's model, what is the radius of the first Bohr orbit (n=1) in a hydrogen atom? (Use a₀ = 0.53 Å)
An electron jumps from n=4 to n=2 in a hydrogen atom. Find the wavelength of the emitted photon. (Use hc = 1240 eV·nm, E₄ = -0.85 eV, E₂ = -3.4 eV)
What is the maximum number of electrons that can occupy the M shell (n=3) of an atom?
In the Bohr model of hydrogen, what is the orbital angular momentum of an electron in the second Bohr orbit (n=2)?
According to Bohr's model, the radius of the first Bohr orbit (n=1) of a hydrogen atom is approximately 0.53 Å. What will be the radius of the third Bohr orbit (n=3)?
The energy of an electron in the second orbit of a hydrogen atom is -3.4 eV. What is the energy of the electron in the first orbit?
An electron transitions from n=4 to n=2 in a hydrogen atom. What is the wavelength of the emitted photon? (Use Rydberg constant R = 1.097 × 10⁷ m⁻¹)
Which of the following correctly defines the principal quantum number (n) in the context of atomic structure?