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Radioactivity (Atoms (Structure (Nucleons (Neutrons, Protons (+)),…

- - - - Neutrons
      - Protons (+)
- - - - Least penetrating power (stopped by paper sheet)
      - Most ionising
      - Two protons and two neutrons
        
        Positively charged
        
        Largest mass
    - - Medium penetrating power (stopped by aluminium sheet)
      - Ionising power between alpha and gamma
      - A single electron
        
        Negatively charged
        
        Mass is between alpha and gamma
    - - Least ionising
      - Most penetrating power (stopped by few inches of lead)
      - Made of energy
        
        No mass
        
        No charge