An atom can exist without electrons, exemplified by hydrogen ions (H+) and alpha particles (He2+). In the gas phase, cationic species can be considered "electronless." The discussion clarifies that while alpha particles are often confused with neutral helium atoms, they are actually bare helium nuclei. The consensus is that while it is theoretically possible to remove all electrons from an atom, it is challenging for medium to large atoms due to their high nuclear charge.
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chem_tr said:ZapperZ, I am doubtful about this. When you write the alpha particle, ^{4}_{2}He, you'll see that two electrons are present as this compound is neutral and monoatomic. You'd be correct if this compound were a 2+ ion. Or is there something I don't know?