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  4. An α -particle can be represented by a:

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Q. An $ \alpha $ -particle can be represented by a:

Bihar CECEBihar CECE 2001

Solution:

Alpha particles are composite particles consisting of two protons and two neutron tightly bound together as shown in figure. They are emitted from the nucleus of some radio nuclides during a form of radioactive decay, called alpha-decay. An alpha particle is
image
identical to the nucleus of a normal (atomic mass 4) helium atom or a doubly ionized helium atom.