Electrostatic force is number 2 in an ordered list of discovered fundamental forces by strength. So to test out its strength some highly advanced aliens think it would be great to check whether they can blow up planets with it. They have a device than simply converts matter into a sea of electrons with 97% efficiency(For example if use use this device on 100 atoms of helium it generates ~97*8 = 776 electrons in their place while using the mass of helium to power itself) . These kindhearted aliens then turn to our planet (a.k.a the earth) to test their device. They think that using their device to turn 50% of earth's inner core to electrons would be fun (Assume this device replaced all of the targets atoms/molecules at once).
But how much damage could this awesome weapon cause to a planet if used without caring for the energy requirements?
Also If the above experiment is done is there any way that life on the planet might survive?