Ionization energy
Ionization energy is the amount of energy needed to completely displace the valence electron from its nucleus.
Steps to finding the value of the first ionization level
Consider these two formulas when solving for the ionization energy: E=hf and c=λf where E is energy,h is Planck's constant, f is the frequency, c is the speed of light and λ is the wavelength. To help explain the steps we'll use an example: If Helium's convergence limit is 50.5 nano meters, calculate the first ionization energy level in KJ/mol
- What do we know? the wavelength λ is 50.5 nano meters,
- Is it in format? no because it is in nano meters so we have to multiply by 10^-9 -> 50.5*10^-9
- Substitute into c=fλ. We know the speed of light is 3*10^8 m/s and λ is 50.5*10^-9 m to find the frequency we have to rearrange the formula so that f=(3*10^8)/(50.5*10^-9) therefore f=5.940594...*10^15 /s
- Substitute into E=hf ->(5.940594...*10^15 /s)*Planck's constant (6.64*10^-36) = 3.94455...*10^-18
- This would give an answer that is expressed in J, to make it J per mole we have to multiply by Avogadro's constant.then divide by 1000 to give KJ/mol -> (3.94455...*10^-18) * Avogadro's constant(6.02*10^23) = 2371880 -> 2371880/1000 to give 2371.88 KJ/mol
*If you have an Avogadro's number of avocados you can make so much guacamole that it would weigh a little over two times the mass of the moon*