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Explore 77 free Atoms and Elements questions in PUCET (Punjab) Chemistry. Each question opens with answer choices, the correct answer and a worked solution.
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Showing questions 1–30 of 77.
The maximum number of electrons that can be accommodated in the $n$-th shell of an atom is:Read the answer and worked solution →The four quantum numbers describing an electron in an atom are:Read the answer and worked solution →According to Heisenberg's uncertainty principle, $\Delta x \cdot \Delta p \geq$:Read the answer and worked solution →Two electrons in the same orbital must have:Read the answer and worked solution →Calculate the de Broglie wavelength of an electron moving at $10^6$ m/s. (Take $h = 6.6 \times 10^{-34}$ J·s, $m_e = 9.1 \times 10^{-31}$ kg)Read the answer and worked solution →Bohr's first postulate: electrons revolve in ___ orbits around the nucleus.Read the answer and worked solution →In Bohr's model, angular momentum of an electron in orbit n equals:Read the answer and worked solution →Energy of electron in n-th orbit of hydrogen:Read the answer and worked solution →Principal quantum number n indicates:Read the answer and worked solution →Number of orbitals in subshell of azimuthal quantum number l:Read the answer and worked solution →How many electrons can fit in a single orbital?Read the answer and worked solution →Electron configuration of carbon (Z = 6):Read the answer and worked solution →For hydrogen, wavelength emitted in n=3 to n=2 transition (Balmer):Read the answer and worked solution →de Broglie wavelength of an electron with momentum p:Read the answer and worked solution →Heisenberg uncertainty principle:Read the answer and worked solution →Number of subshells in shell with n = 3:Read the answer and worked solution →Electron configuration of nitrogen (Z = 7):Read the answer and worked solution →Total number of electrons that can occupy shell with n = 4:Read the answer and worked solution →Magnetic quantum number m_l for a 3d orbital can be:Read the answer and worked solution →Wavelength of light needed to ionize hydrogen from ground state (13.6 eV):Read the answer and worked solution →Radius of n-th Bohr orbit for hydrogen (a₀ ≈ 0.529 Å):Read the answer and worked solution →Effective nuclear charge Z_eff for the 2p electron of carbon (using Slater's rules approximately):Read the answer and worked solution →For He⁺ ion (1 electron, Z = 2), energy in ground state:Read the answer and worked solution →The Pauli exclusion principle states that two electrons in an atom cannot have:Read the answer and worked solution →Energy of the photon emitted in a hydrogen transition from n=4 to n=2:Read the answer and worked solution →Number of nodes in a 3p orbital (n=3, l=1):Read the answer and worked solution →For Bohr's hydrogen-like atom, what is the velocity of electron in n-th orbit (in terms of fine structure constant α and c)?Read the answer and worked solution →Photoelectric effect: when light of frequency ν falls on a metal of work function φ, KE of emitted electrons is:Read the answer and worked solution →The wave number $\bar{\nu}$ of electromagnetic radiation is defined asRead the answer and worked solution →In vacuum, the velocity of electromagnetic radiation isRead the answer and worked solution →
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