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# Chapter 7

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

Question | Answer |
---|---|

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 |