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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Area code 1-899 is used in Mexico, and also, no area code in North America is currently issued with the middle digit 9 since that number is reserved in case of future expansion. These numbers are free to the caller if dialed from a land-line phone but will incur mobile airtime charges for cellular phones.n the United States of America, Canada, and other North American Numbering Plan countries, a toll-free telephone number is any number in these area codes: