7. An alpha particle that is emitted as nuclear radiation has the same structur a. hydrogen nucleus. b. helium nucleus. c. neutron. d. electron.

The correct answer is b. helium nucleus.<br /><br />An alpha particle is a type of nuclear radiation that is emitted during certain types of radioactive decay. It consists of two protons and two neutrons, which is the same as the nucleus of a helium atom. Therefore, an alpha particle has the same structure as a helium nucleus.