Chemistry
Across
- 4. substances that cannot be broken down into simpler substances
- 6. Formulas a combination of chemical symbols & numbers that indicate which elements & how many atoms of each element are present in a compound
Down
- 1. a small space at the center of an atom which contains protons and neutrons
- 2. the smallest particle of an element
- 3. change occurs when the physical properties are changed, such as size or shape
- 5. Mendeleev a Russian scientist discovered a set of patterns that seemed to apply to all elements
- 7. Moseley discovered a way to measure the positive charge in the nucleus to determine the atomic number