1
2		3
4																		5
											6
				7
															8
9
10
																				11
12
	13
							14

Across 3. an electron emitted by an unstable nucleus 4. the powerful attractive force that binds protens 6. a penetrating form of radiation emitted by an unstable nucleus 7. a nuclear reaction in which the nuclei of two atoms combine to form a larger nucleus 9. a positively charged particle, emitted by certain radioactive nuclei, made up of two protons & two neutrons: a helium nucleus 10. charged particles & electromagnetic waves that are emitted from the nuclei of radioisotopes 12. the process in which an unstable atomic nucleus emits charged particles & energy 13. the smallest possible mass of a fissionable material that can sustain a chain reaction 14. the time required for one half of a sample of a radioactive isotope to decay

Down 1. nuclear radiation that occurs naturally in the environment 2. a nuclear reaction in which an atomic nucleus is split into two smaller parts 5. a series of fission reactions triggered by neutrons released during the fission of an nucleus 8. an isotope with an unstable nucleus 11. a state of matter in which atoms have been stripped of their electrons