Across
- 5. type of decay in which an atom splits and emits an alpha particle consisting of two protons and two neutrons
- 7. the minimum amount of energy required to start a chemical reaction
- 9. big number out front of an element or formula used to balance chemical equations
- 10. type of reaction that requires the presence of oxygen
- 13. the breakdown of a radioactive element, releasing particles and energy
- 14. the splitting of a massive nucleus into smaller nuclei, releasing energy
- 16. a fat that is liquid at room temperature; found in vegetable oils, nuts, and seeds
- 17. the length of time required for half of the radioactive atoms in a sample to decay
- 18. elements or compounds that enter into a chemical reaction
Down
- 1. type of decay that releases gamma rays from a nucleus
- 2. element used for fusion energy produced by the sun
- 3. the process by which two or more small nuclei fuse to make a bigger nucleus
- 4. the SI base unit to measure the amount of a substance
- 6. the elements or compounds produced by a chemical reaction
- 8. the smallest possible mass of a fissionable material that can sustain a chain reaction
- 11. type of radioactive decay in which an electron is emitted
- 12. energy that is radiated or transmitted in the form of rays, waves, or particles
- 15. a substance that speeds up the rate of a chemical reaction but is not used up in the reaction