all about matter

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Across
  1. 2. made up of different kinds of atoms from different elements chemically combined
  2. 5. particles made up of two or more atoms of one element that are joined together chemically
  3. 7. are the basic building blocks of matter
  4. 8. a pure substance that is made up of only one type of atom
  5. 11. is a measure of the amount of mass in a given volume
  6. 13. subatomic particles that have a positive electric charge.
  7. 14. is a measure of the gravitational force on an object
  8. 15. Any material that possesses physical properties
Down
  1. 1. part of an atom that has no charge
  2. 3. is the amount of space that an object takes up
  3. 4. variety of elements and compounds that are not chemically combined with each other
  4. 6. a very small part of an atom that is negatively charged
  5. 9. is the amount of matter in an object
  6. 10. is anything that has mass and takes up space.
  7. 12. is a characteristic of a substance that can be observed and measured without changing the identity
  8. 16. a substance's ability to change in to a new substance with different properties.