Across
- 5. an attribute, quality, or characteristic of something.
- 8. relating to an atom or atoms.
- 9. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 12. a substance that cannot be broken down into simpler components
- 13. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 15. a thing that is composed of two or more separate elements; a mixture.
- 16. relating to the nucleus of an atom
- 19. forming a necessary base or core; of central importance.
Down
- 1. a particular kind of matter with uniform properties.the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
- 2. a feature or quality belonging typically to a person, place, or thing and serving to identify it.
- 3. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 4. the nature of something's ingredients or constituents; the way in which a whole or mixture is made up.
- 6. a minute portion of matter.
- 7. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 9. a substance made by mixing other substances together.
- 10. remaining the same in all cases and at all times; unchanging in form or character.
- 11. the way in which a natural phenomenon or a machine works or functions.
- 14. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
- 17. the basic unit of a chemical element.
- 18. the idea that every substance has at least one property that makes it unique and able to be differentiated from other substances