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    The mercury atom has an ionisation energy of 10.4ev. calculate the ionisation energy in joules.

    so confused

    tyvm for help

    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

    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)
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