CHEM 1A Chapter 2: Atoms and Quantum Theory
Document Summary
Charge of an electron: 1. 602x10-19 c: called the fundamental charge. Atomic number z: number of protons: total charge = z+ze (e is negative) Spectroscopy analysis of the light emitted or absorbed by substances. Light is a form of electromagnetic radiation. C = 3x108 m/s (speed of light) Frequency ( ): number of cycles per second (hz or s-1) Amplitude: height of the wave above the center line. Long wavelength: low frequency: lower energy c = x . Spectral line: radiation of a single wavelength emitted or absorbed by an atom/molecule. Absorption spectrum: dark lines on a continuous spectrum that indicate frequencies absorbed by the atom (each element has a characteristic absorption spectrum) Lines arise from transitions: change of state b/w two allowed energy levels. Exchange of energy between matter and radiation occurs in quanta: packets of energy. H: planck"s constant = 6. 626 x 10-34 j*s or (kg*m2)/(s)
