Q. An -particle can be represented by a:

 1242  202 Bihar CECEBihar CECE 2001 Report Error

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.