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