The mercury atom has an ionisation energy of 10.4ev. calculate the ionisation energy in joules.
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What is the electron volt? watch
- Thread Starter
- 27-03-2011 17:47
- 27-03-2011 18:13
It's a standard unit of energy equal to 1.60 x 10-19 J
It comes from the amount of energy required to move an electron through a pd of one volt.
That equals the charge on an electron times 1 volt, and the charge on an electron is 1.6 x 10-19 C
- 27-03-2011 18:21
basically it is still energy in joules, its just a more convenient scale for certain situations.
Think of it like this, an electronic company measures the resistance of their components using kilo-ohms rather than ohms because it is easier to compare and contrast the resistance on first sight
same thing with electronvolt, I can see the values more clearly because 9.5eV is easier to read than something like 12 x 10^15 J (made that up)