Across
- 2. a subatomic particle of about the same mass
- 3. number the total number of protons and neutrons in a nucleus.
- 6. consisting in or characterized by the absence rather than the presence of distinguishing features.
- 9. consisting in or characterized by the presence rather than the absence of distinguishing features.
- 11. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
- 13. relating to chemistry, or the interactions of substances as studied in chemistry
- 14. a stable subatomic particle with a charge of negative electricity,
Down
- 1. the smallest particle of a chemical element that can exist.
- 3. a substance made by mixing other substances together.
- 4. each of more than one hundred substances
- 5. a stable subatomic particle occurring in all atomic nuclei,
- 7. number the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
- 8. a substance formed from two or more elements c
- 10. a group of atoms bonded together
- 12. shell The shells holding electrons surrounding the nucleus.