- [Medium]Approximate wavelength (nm) of the photon emitted when an electron in hydrogen atom drops from n=4 to n=2 (Balmer series):...
- [Easy]Effective nuclear charge (Z_eff) experienced by valence electrons increases across a period mainly because:...
- [Easy]Which statement best explains Pauli's exclusion principle?...
- [Easy]Which subshell is filled first according to the Aufbau principle?...
- [Hard]Electron affinity is generally highest for which of the following?...
- [Medium]Number of unpaired electrons in Cu2+ (Z=29) is:...
- [Medium]Among the following, which species has the highest first ionization energy?...
- [Hard]An electron is accelerated through a potential difference of 150 V. Its de Broglie wavelength is closest to (in nm): (h = 6.626×10⁻³⁴ J s, m_e = 9.11×...
- [Medium]Spin-only magnetic moment (μ) in Bohr magnetons for a high-spin d5 ion (e.g., Mn2+) is approximately:...
- [Easy]Maximum number of electrons possible in the shell with n = 4 is:...
- [Easy]Which element has the configuration [Ne] 3s2 3p4?...
- [Easy]The ground state electronic configuration of nitrogen (Z=7) according to Hund's rule is:...
- [Medium]Energy difference (ΔE) between n=2 and n=4 levels of hydrogen atom is approximately (in eV):...
- [Easy]How many orbitals are present in the shell with principal quantum number n = 3?...
- [Easy]The principal quantum number (n) primarily determines which property of an electron in an atom?...
- [Medium]Which set of quantum numbers (n, l, m_l, m_s) is NOT allowed?...