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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The next three digits of a landline number or cellphone number are called the NXX. The NXX is also known as the prefix or exchange. Various telephone carriers will reserve blocks of telephone numbers by reserving an NXX within an area code. Like area codes, not all prefixes are currently in use.