Across
- 2. smallest amount of matter that retains chemical properties, pure substance
- 4. is the sum of the neutrons and protons
- 6. number of decays per second in a radioactive substance
- 7. nucleus of an isotope
- 11. the number of protons in an atom's nucleus
- 13. positively charged pieces of the nucleus
- 14. radioactive decay where alpha particles are emitted
- 15. nuclei with small masses combined into one big nucleus and energy is released
- 16. neutrally charged pieces of the nucleus
Down
- 1. each of differing forms of same atom with different masses but same chemical properties
- 3. materials that undergo decay and emit penetrating rays
- 5. a nucleus is divided in two or more fragments, neutrons and energy are released
- 8. negatively charged pieces of the nucleus
- 9. the atom's atomic _____ is measured in amu's
- 10. elements joined in a chemical bond
- 12. energy equivalent to the mass defect
- 14. unit of mass that is equal to 1.66*10^-27 kg