Across
- 2. the quantity of matter which a body contains
- 5. the subatomic particle found in the nucleus with a neutral charge
- 6. the degree of compactness of a substance
- 8. something made up or consisting of two or more existing parts or elements
- 10. a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei
- 11. the central core of an atom
- 12. a substance or matter in a state in which it will expand freely to fill the whole of a container; not solid or liquid
- 14. the subatomic particle found in the orbitals with a negative charge
- 15. firm and stable in shape; not liquid or fluid
- 16. a substance that flows freely but is of constant volume; not solid or gaseous
- 18. this person proposed a theory for the hydrogen atom
Down
- 1. the basic unit of a chemical element
- 3. the mass of an atom of a chemical element expressed in units
- 4. Table a table of the chemical elements arranged in order of atomic number
- 7. this person developed the periodic classification of the elements
- 9. a group of atoms chemically bonded
- 10. Cloud the system of electrons surrounding the nucleus of an atom
- 13. the number of protons in the nucleus of an atom
- 17. the subatomic particle found in the nucleus with a positive charge