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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(March 2013). A telephone prefix is the first set of digits after the country-and area codes of a telephone number; in the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit phone number. In other countries both the prefix and the number may have different lengths.It shows which exchange the remaining numbers refer to. A full telephone number is usually made up of country code (required for international calls only), area code (required for calls between telephone areas), prefix, and subscriber number. full telephone number is usually made up of country code (required for international calls only), area code (required for calls between telephone areas), prefix, and subscriber number.