by John Carl Villanueva on July 23, 2009. An alpha particle is a particle made up of two protons and two neutrons. Since this configuration is similar to that of a helium nucleus, itâs often referred to as a helium nucleus.The term is commonly used in nuclear physics, and is one of the three particles commonly emitted during a radioactive decay, i.e., alpha, beta, and gamma particles.ince this configuration is similar to that of a helium nucleus, itâs often referred to as a helium nucleus. The term is commonly used in nuclear physics, and is one of the three particles commonly emitted during a radioactive decay, i.e., alpha, beta, and gamma particles.
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How to Find a Telephone Prefix for a City. A telephone prefix, also called a telephone exchange, makes up the second set of three numbers in a 10-digit phone number. For example, 555 is the prefix in the mock telephone number 202-555-1234. If the city you would like to know the telephone prefix for is local, that city's telephone prefix numbers will be in the introductory pages of the White Pages phone book. You can look up the prefix numbers there, or online.