Answer:
When all the electrons are removed from an atom, it becomes something as a positively charged particles also known as alpha particles.
Explanation:
The bare nucleus which is positively charged help in scattering experiments as it has high penetrating powers. An atom is made up of electrons, protons and neutrons. We need huge energy to separate the electrons from their parent atom, still making it separated brings you a particle with a positive charge and only mass having high penetrating power.