- [Medium]The energy of the electron in the ground state of the hydrogen atom is -2.18 × 10^-18 J. What is the energy of the photon emitted when an electron in ...
- [Easy]An element X has two naturally occurring isotopes: X-35 with 75% natural abundance and X-37 with 25% natural abundance. What is the average atomic mas...
- [Medium]The radius of the first Bohr orbit for hydrogen is 0.529 Å. What would be the radius of the second orbit for Li^{2+} ion (Z=3)?...
- [Medium]In a multi-electron atom, the effective nuclear charge Z_eff experienced by an electron in the 3p subshell of phosphorus (Z=15) is lower than the actu...
- [Easy]Which spectral series of hydrogen involves electron transitions to the n=3 level, and in which region of the electromagnetic spectrum does this series...
- [Easy]According to Hund's rule of maximum multiplicity, which electronic configuration represents the correct ground state filling of the 2p subshell with e...
- [Medium]Electromagnetic radiation of wavelength 300 nm has a certain energy per photon. How many photons of this radiation are needed to provide exactly 1 J o...
- [Easy]Which of the following statements correctly describes the shape and orientation of the p_z orbital relative to the p_x and p_y orbitals?...
- [Medium]What is the minimum energy required in electron volts to completely remove an electron from the n=2 orbit of a He^+ ion? (Given: Z=2 for helium, ioniz...
- [Easy]For a 3d orbital in a hydrogen-like atom, what are the numbers of radial nodes and angular nodes respectively?...
- [Medium]The work function of a metal surface is 2.3 eV. What is the kinetic energy of the photoelectrons emitted when light of frequency 8.0 × 10^14 Hz strike...
- [Easy]The ground state electronic configuration of Cu (Z=29) deviates from the expected Aufbau order. Which configuration correctly represents copper in its...
- [Easy]Calculate the de Broglie wavelength of an electron moving with a velocity of 2.0 × 10^6 m/s. (Given: m_e = 9.11 × 10^-31 kg, h = 6.626 × 10^-34 J·s)...
- [Easy]Which set of quantum numbers is NOT possible for an electron in an atom according to the rules governing quantum mechanical description of electrons?...
- [Medium]An electron in a hydrogen atom transitions from the third energy level to the first energy level. What is the wavelength of the photon emitted during ...
- [Medium]The first ionization energy of hydrogen atom is 13.6 eV. What is the ionization energy of He⁺ ion?...
- [Easy]According to Heisenberg's uncertainty principle, which of the following statements is correct?...
- [Medium]According to Pauli's exclusion principle, the maximum number of electrons in an atom that can have the quantum numbers n = 4 and m = -2 is:...
- [Easy]The correct electronic configuration of nitrogen (Z = 7) in its ground state, following Hund's rule, is:...
- [Easy]Which series of hydrogen spectrum lies in the ultraviolet region?...
- [Medium]The work function of a metal is 3.3 eV. What is the maximum wavelength of light that can cause photoelectric emission from this metal?...
- [Hard]An electron is accelerated through a potential difference of 100 V. Its de Broglie wavelength is approximately:...
- [Medium]According to the Aufbau principle, which orbital is filled before 4p?...
- [Easy]Which of the following orbitals does not exist?...
- [Medium]The number of unpaired electrons in Fe²⁺ (Z = 26) is:...
- [Easy]The maximum number of electrons that can have n = 3 and l = 2 is:...
- [Easy]According to Bohr's model, the energy of an electron in the nth orbit of a hydrogen atom is given by E = -13.6/n² eV. What is the energy of an electro...
- [Medium]The electronic configuration of chromium (Z = 24) is:...
- [Hard]The wavelength of the first line in the Balmer series of hydrogen spectrum is 656 nm. The wavelength of the second line of this series is approximatel...
- [Medium]Which of the following sets of quantum numbers is not possible for an electron in an atom?...