Across
- 3. A compound n which the atoms are held together by covalent bonds.
- 6. The neutral part of an atom
- 9. Atoms of the same element that have the same number of protons and electrons but have a different number of neutrons
- 10. __________ Isotopes are broken down by radiation when the nucleus of an atom breaks up
- 13. A pure substance that cannot be broken down by physical means
- 14. The beginning portion of a chemical reaction
- 15. The positively charged part of an atom
- 18. __________-12 is used to date substances that have once been alive
Down
- 1. The result of a chemical reaction
- 2. Neutrons and Protons are located in the __________
- 4. ____________ = Atoms
- 5. ____________ bonds occur when electrons are shared
- 7. Part of the atom located on the outside of the nucleus
- 8. Are the process by which atoms or groups of atoms in substances are reorganized into different substances
- 11. ________ bonds occur when electrons are shared
- 12. The study of matter
- 16. Carbon ____________ happens when nitrogen becomes carbon through beta decay
- 17. The building blocks of matter