Though I am supposed to know these by heart.

• Electron:
  • mass: 9.11 exp -31 kg
  • charge: -1.6 exp -19 C
• Proton:
  • mass: 1.67 exp -27 kg
  • charge: 1.6 exp -19 C
• Neutron:
  • mass: 1.67 exp -27 kg
• Planck's
  • 6.63 exp -34 m^2 kg s^-1
• von Klitzing's
  • 25812.8 ohms
• Avogadro's
  • 6.02 exp 23 mol^-1
• Boltzmann's
  • 1.38 exp -23 m^2 kg s^-2 K^-1
• Stefan-Boltzmann's
  • 5.67 exp -8 W m^-2 K^-4
• Faraday's
  • 96485 C mol^-1
• Rydberg's
  • 10.97 exp 6 m^-1
• Josephson's
  • 4.8 exp 9 Hz V-1
• Permeability of Free Space
  • 1.26 exp -6 m kg s^-2 A^-2
• Permittivity of Free Space
  • 8.85 exp -12 m^-3 kg^-1 s^4 A^2
• Velocity of Electromagnetic Radiation
  • 2.998 exp 8 m s^-1
• Newtonian Gravitational Constant
  • 6.67 exp -11 m^3 kg^-1 s^-2
• Bohr Magneton
  • 927.4 exp -26 J T^-1