Across
- 2. positively charged particles
- 4. amount of matter in a substance
- 6. the degree of compactness of a substance
- 13. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
- 14. any substance that cannot be decomposed into simpler substances by ordinary chemical processes
- 15. theory consisting of a positively charged nucleus with electrons revolving around it in any of many possible circular orbits each corresponding to a distinct energy state
- 16. atoms are completely apart in this state of matter
- 17. the central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons
Down
- 1. composed of or resulting from union of separate elements
- 3. atoms are compressed together during this state of matter
- 5. the mass of an atom of a chemical element expressed in atomic mass units
- 7. neutral charged particles
- 8. is often referred to as the Father of the Periodic Table
- 9. negatively changed particles
- 10. cloud molecule a group of electrons circulating around a nucleus/molecule
- 11. atoms are slightly spread out in this state of matter
- 12. a table of chemical elements arranged in order
- 13. basic unit of matter