Across
- 4. Anything that has mass and takes up space.
- 5. A type of reaction when the small nuclei combine to form larger nuclei. This happens inside the sun.
- 7. The energy an object has because of its position; also the internal stored energy of an object such as energy stored in chemical bonds.
- 10. A small particle in the nucleus of an atom, with no electrical charge.
- 12. The splitting of an atom's nucleus into two nuclei, which releases a great deal of energy.
- 14. An arrangement of the elements showing the repeating pattern of their properties.
- 18. A French chemist who proved that matter is not created or destroyed in any chemical or physical change.
- 20. A characteristic of a substance that describes its ability to change into different substances.
- 21. A change in which one or more substances combine or break apart to form new substances.
- 22. Kinetic or potential energy associated with the motion or position of an object.
Down
- 1. A form of energy that is stored in chemical bonds between atoms.
- 2. The number of protons in the nucleus of an atom.
- 3. A neutral group of two or more atoms held together by covalent bonds.
- 6. The energy of electric charges.
- 8. A reaction that releases energy, usually in the form of heat.
- 9. A tiny particle that moves around the outside of the nucleus of an atom. It has a negative charge.
- 11. The average mass of all the isotopes of an element.
- 13. A reaction that absorbs energy.
- 15. A small, positively charged particle that is found in the nucleus of an atom.
- 16. Energy that depends on the height of an object.
- 17. Energy that an object has due to its motion.
- 19. The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.