Question

What will happen if there will be no electrons in an atom?

Answer 1

There are two pretty common forms of “no electron atoms”. Strictly speaking, of course, they are no longer atoms. A proton can be thought of as a Hydrogen atom without an electron and an alpha particle can be thought of as a Helium atom without electrons. Such things are useful as projectiles in scattering experiments, since they can be accelerated electro-statically, or electro-dynamically.