Nuclear Crossword

2. Japanese city where the first atomic bomb was dropped
4. charged atoms
8. Decay, the emission of energy in the form of ionizing radiation
11. smallest part of an element that retain the properties of that element
13. any of the chemical elements that lie beyond uranium in the periodic table
17. Decay, nothing to the mass and adds 1 to the number of protons
19. Reaction, a series of chemical reactions where the products of the reaction contribute to the reactants of another reaction
21. energy that comes from a source and travels through space at the speed of light
22. Boy, first atomic weapon

1. 2 or more things combining
3. Number, number of protons
5. release of energy from the decay of the nuclei and other kinds of atoms and isotopes
6. Life, amount of time it takes for one half of the radioactive isotopes to decay
7. Decay, subtracts 4 to the mass and 2 to the number of protons
9. Decay, nothing to the mass and number of protons
10. dividing or splitting something into 2 or more parts
12. Curie, discovered the elements polonium and radium
14. a variation of an element that possesses the same atomic number but a different mass number
15. Number, number of protons plus number of neutrons
16. Japanese city where the second atomic bomb was dropped
18. Electrons, outmost electrons
20. Man, implosion type nuclear weapon with a solid plutonium core