# What is the Binding Energy of an Electron to a Metal Surface?

• McMaster_Girl
In summary, the binding energy (kj/mol) of an electron to the metal surface is related to the threshold wavelength for the onset of the photoelectric effect and can be calculated using E=hv. To convert the result to kJ/mol, it must be converted to joules and multiplied by Avogadro's number.
McMaster_Girl
Ok, so the question is:

A metal has a threshold wavelength for the onset of the photoelectric effect of 662 nm. What is the binding energy (kj/mol) of an electron to the metal surface.

I used E=hv to get the photon energy, so is that the binding energy as well? If so, how do i convert it to kJ/mol, do i use avagadro's number?

Any help is appreciated, thanks!

Yes and yes! You have this one nailed.

To convert it to kJ/mole you first convert the result from E=hv to joules and the multiply the result by Avogadros number.

## 1. What is electron binding energy?

Electron binding energy is the amount of energy required to remove an electron from its atomic orbital in an atom. It is also known as ionization energy.

## 2. How is electron binding energy measured?

Electron binding energy is typically measured in units of electron volts (eV) using a spectrometer, which can detect the energy of ejected electrons.

## 3. What factors affect electron binding energy?

The main factors that affect electron binding energy include the type of atom, the number of protons in the nucleus, the distance between the electron and nucleus, and the electron's energy level.

## 4. Why is electron binding energy important in chemical reactions?

Electron binding energy plays a crucial role in chemical reactions as it determines how easily an atom can lose or gain electrons. This, in turn, affects the stability and reactivity of atoms, which is essential in understanding and predicting chemical reactions.

## 5. How does electron binding energy differ between elements?

The electron binding energy varies between elements due to differences in their atomic structure. Elements with more protons in the nucleus have a stronger binding energy, making it more difficult to remove electrons. Additionally, the arrangement of electrons in different elements also affects their binding energy.

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