Atomic models and periodicity | Chemistry | Khan Academy - Atomic spectra | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:particle-behaviors-of-em-radiation/v/atomic_spectra Want to explore more? Check out the full Atomic models and periodicity playlist here: https://www.youtube.com/playlist?list=PLSQl0a2vh4HD2AZcy7Pe8mHAiO5UG2WKt Electrons only exist at specific, discrete energy levels in an atom. If an electron absorbs a photon with energy equal to the difference between two energy levels, the electron will transition to the higher energy level. The atom is then in an excited state. When an electron transitions to a lower energy level, it emits a photon with energy equal to the difference. Every element has a unique emission/absorption spectrum, making atomic spectral lines a valuable tool for identifying elements in distant astronomical objects. Sections: 00:00 - Intro 00:26 - Electron potential well 03:08 - Orbital shapes 05:37 - Bohr model and energy level diagram 07:09 - Electron excitation and de-excitation 09:36 - Hydrogen's spectrum 10:54 - Spectral analysis 11:46 - Absorption spectrum 14:11 - Summary ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc