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# Chapter 7

### The Quantum-Mechanical Model of the Atom (Test 3)

wavelength lambda; units in length
frequency nu; units in Hz or 1/s
amplitude the intensity or brightness of light
E sub photon the energy of one photon of light
h Planck's constant; 6.626 * 10^-34 J*s
c speed of light; 2.998 * 10^8 m/s
What equation can you relate wavelength, frequency, and the speed of light? lambda = c / nu nu = c / lambda lambda*nu = c
What is Planck's Law, which relates energy, wavelength, frequency, Planck's constant, and the speed of light? E sub photon = h * nu E sub photon = h (c/lambda)
What is the de Broglie equation, which relates wavelength to Planck's constant, mass, and velocity? lambda = (h)/(m*v)
What is the equation for En? En = -2.18 * 10^-18 J * (1/(n^(2)))
As the electromagnetic spectrum goes from Gamma Rays to radio waves, what happens to wavelength, energy, and frequency? Wavelength increases from Gamma Rays to radio waves, but energy and frequency increase from radio waves to Gamma Rays.
What is the wavelength range of visible light? 400-700nm
What is the photoelectric effect? When light shines on the surface of a metal, electrons are emitted. However, there is a threshold frequency and no time lag.
The energy of a photon depends only on what? frequency
Light behaves as both ...? waves and particles
Energy is what? quantized
The Heisenberg Uncertainty Principle says what? It is impossible to know both the position and the momentum (mv) of a particle simultaneously.
What does a 1s orbital look like? a sphere
What does a 2p orbital look like? a bow-tie, with the sub letter indicating which axes the sides of the bow-tie are on.
What does a 3d sub x^(2)-y^(2) orbital look like? a four-leaf clover with its leaves on the axes
What does a 3d sub xy, xz, or or yz orbital look like? a four-leaf clover with its leaves between the axes, in the plane of the indicated axes
What does a 3d sub z^(2) orbital look like? a 2p sub y orbital with a donut around the origin
What is the principal quantum number? n; describes the shell of the electron; n = 1, 2 , 3, ...
What is the angular momentum quantum number? (also called the azimuthal quantum number) l; describes the shape of the orbital; l = 0 (s), 1 (p), 2 (d), 3 (f)...
What is the magnetic quantum number? m sub l; describes the orientation of the orbital; m sub l = -l to l.
What is the spin quantum number? m sub s; describes the "spin" of an electron; m sub s = -1/2 or +1/2
Created by: 2nenogirl