Across
- 4. A neutral particle located in the nucleus of an atom.
- 5. A chart organizing elements by increasing atomic number and similar properties.
- 7. mass The total number of protons and neutrons in an atom’s nucleus.
- 8. A vertical column in the periodic table, indicating elements with similar chemical properties.
Down
- 1. A negatively charged particle that orbits the nucleus.
- 2. A horizontal row in the periodic table.
- 3. The energy level where electrons are found around an atom’s nucleus.
- 6. The smallest unit of matter that retains the properties of an element.
- 7. number The number of protons in the nucleus of an atom.
- 9. A positively charged particle found in the nucleus of an atom.