Across
- 3. pure substance made of only 1 type of atom that can not be broken down further into other substances.
- 6. collection of elements
- 7. are called PERIODS and the columns are called GROUPS.
- 9. chemical element with symbol O and atomic number 8.
- 10. separates the interior of the cell from the outside environment.
- 11. the basic unit of a chemical element.
- 13. a subatomic particle with a positive electric charge.
Down
- 1. of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 2. A small particle with a negative charge that is found in all atoms.
- 4. a substance made from two or more different elements that have been chemically joined.
- 5. a particle with a neutral charge
- 8. type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals.
- 12. a column in the periodic table of the chemical elements.