Atomic Structure Class 11 Notes Pdf -

Defines the main shell and size (

Energy is emitted or absorbed only when an electron jumps between shells. Angular momentum is quantized: Quantum Mechanical Model atomic structure class 11 notes pdf

𝑠 ): Direction of electron spin (+1/2 or -1/2). 6. Electronic Configuration Rules The distribution of electrons follows three key principles: Aufbau Principle: Electrons fill lower-energy orbitals first. Pauli’s Exclusion Principle: No two electrons in an atom can have the same four quantum numbers. Hund’s Rule: Orbitals of equal energy are each occupied by one electron before any orbital is doubly occupied. Conclusion Understanding atomic structure allows us to predict the chemical behavior of elements and the nature of chemical bonding. From Rutherford’s nucleus to the electron clouds of quantum mechanics, our grasp of the atom continues to refine our understanding of the universe. Would you like a summary of the Defines the main shell and size ( Energy

| Concept | Formula | Variables | |---|---|---| | Wavelength of e⁻ | ( \lambda = \frachmv ) | h = Planck’s constant ((6.626\times10^-34) Js) | | Energy of H-like atom | ( E_n = -13.6 \fracZ^2n^2 ) eV | Z = atomic number | | Radius of nth orbit | ( r_n = 0.529 \fracn^2Z ) Å | 1 Å = (10^-10) m | | Photon energy | ( E = h\nu = \frachc\lambda ) | c = (3\times10^8) m/s | | Rydberg formula (spectra) | ( \frac1\lambda = R_H Z^2 \left( \frac1n_1^2 - \frac1n_2^2 \right) ) | ( R_H = 1.097\times10^7) m⁻¹ | To write electronic configurations correctly

Quantum numbers act like an "address" for an electron, defining its location, energy, and spin.

To write electronic configurations correctly, you must follow these three pillars: