Across
- 3. the electrons in the outermost shell, or energy level of an atom
- 6. the smallest unit into which matter can be divided without release of electricity
- 8. a column in the periodic table of chemical elements
- 9. members of a family of an element that have the same number of protons but different neutrons
- 10. a structural model of an atom
- 11. a subatomic particle with a mass of 1 and charge of 0
- 13. the organized array of all the chemical elements in order of increasing atomic number
Down
- 1. a substance that cannot be decomposed into simpler substances by ordianry chemical processes
- 2. a stable negatively charged component of a neutron
- 4. a column of elements in the periodic table
- 5. a positively changed particle that resides within the atomic nucleus
- 6. the number of protons found in the nucleus of an atom
- 7. A chemical element that exhibits some metal and nonmetal properties
- 12. the combined mass of all the protons, neurons, and electrons that make up an atom