Which statement correctly describes alpha radiation?

Which statement correctly describes alpha radiation?

• A. It consists of 2 protons and 2 neutrons and has a +2 charge
• B. It has a -1 charge
• C. It is electromagnetic radiation
• D. It is a type of neutron emission

Answer: (A)

Alpha radiation is a type of particulate radiation that consists of a helium-4 nucleus emitted from unstable nuclei. It is made up of two protons and two neutrons, giving it a mass number of 4 and an electric charge of +2. This distinguishes it from electromagnetic radiation (like gamma rays) and from neutrons, which are neutral. The +2 charge and the specific composition define alpha particles, and they are known for their relatively large mass and short range in matter, being easily stopped by a sheet of paper or a few centimeters of air.

Alpha radiation is a type of particulate radiation that consists of a helium-4 nucleus emitted from unstable nuclei. It is made up of two protons and two neutrons, giving it a mass number of 4 and an electric charge of +2. This distinguishes it from electromagnetic radiation (like gamma rays) and from neutrons, which are neutral. The +2 charge and the specific composition define alpha particles, and they are known for their relatively large mass and short range in matter, being easily stopped by a sheet of paper or a few centimeters of air.