JEE Main Structure of Atom — practice questions
57 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Structure of Atom in the app →The maximum number of electrons that can be accommodated in the $n$-th shell of an atom is:The four quantum numbers describing an electron in an atom are:
Hund's rule of maximum multiplicity states thatAccording to Heisenberg's uncertainty principle, $\Delta x \cdot \Delta p \geq$:Two electrons in the same orbital must have:Calculate the de Broglie wavelength of an electron moving at $10^6$ m/s. (Take $h = 6.6 \times 10^{-34}$ J·s, Bohr's first postulate: electrons revolve in ___ orbits around the nucleus.In Bohr's model, angular momentum of an electron in orbit n equals:Energy of electron in n-th orbit of hydrogen:Principal quantum number n indicates:Number of orbitals in subshell of azimuthal quantum number l:How many electrons can fit in a single orbital?Electron configuration of carbon (Z = 6):For hydrogen, wavelength emitted in n=3 to n=2 transition (Balmer):de Broglie wavelength of an electron with momentum p:Heisenberg uncertainty principle:Number of subshells in shell with n = 3:Electron configuration of nitrogen (Z = 7):Total number of electrons that can occupy shell with n = 4:Magnetic quantum number m_l for a 3d orbital can be:Wavelength of light needed to ionize hydrogen from ground state (13.6 eV):Radius of n-th Bohr orbit for hydrogen (a₀ ≈ 0.529 Å):Effective nuclear charge Z_eff for the 2p electron of carbon (using Slater's rules approximately):For He⁺ ion (1 electron, Z = 2), energy in ground state:The Pauli exclusion principle states that two electrons in an atom cannot have:Energy of the photon emitted in a hydrogen transition from n=4 to n=2:Number of nodes in a 3p orbital (n=3, l=1):For Bohr's hydrogen-like atom, what is the velocity of electron in n-th orbit (in terms of fine structure consPhotoelectric effect: when light of frequency ν falls on a metal of work function φ, KE of emitted electrons iThe energy of the electron in the $n = 2$ orbit of hydrogen by Bohr's model is:A 3p orbital is specified by:The shape of a p-orbital is best described as:The electronic configuration of nitrogen ($Z = 7$) in the ground state is:Isotopes have the SAME number of:The energy of the nth orbit in a hydrogen atom (Bohr's model) is:The BALMER series of hydrogen corresponds to electron transitions ending at:The de Broglie wavelength of a particle with momentum p is:Heisenberg's uncertainty principle is most accurately stated as:Hund's rule states that electrons in degenerate orbitals:By the AUFBAU principle, the 3d subshell starts filling:The electronic configuration of Cr (Z=24) is an exception, written as:In the photoelectric effect, the kinetic energy of ejected electrons is:The atomic number Z of an element is defined asThe Rutherford α-particle scattering experiment led to the conclusion thatBohr's model of the hydrogen atom postulates that the angular momentum of an electron in an allowed orbit isThe radius of the nth Bohr orbit of hydrogen is proportional toThe energy of the electron in the nth Bohr orbit of hydrogen isThe maximum wavelength in the Lyman series of the hydrogen spectrum (transition n₂ → 1) corresponds to n₂ =Which series of the hydrogen spectrum lies in the visible region?The relationship E = hν (Planck) between photon energy and frequency contains constant h that is approximatelyFor a hydrogen-like ion of atomic number Z, the energy of the nth level isThe de Broglie wavelength associated with a particle of mass m and velocity v isHeisenberg's uncertainty principle statesThe four quantum numbers (n, l, m_l, m_s) fully specify an electron in an atom. The magnetic quantum number m_The Aufbau principle states that electrons fill atomic orbitalsHund's rule states that for degenerate orbitals of a subshell, electronsAn electron and a proton have the same kinetic energy. Which has the larger de Broglie wavelength?