Across
- 3. the horizontal row on the periodic table
- 5. the group of elements
- 6. The group of 7 elements
- 7. negatively charged particles that move around the nucleus
- 9. a pure substance containing one type of atom
- 10. the smallest unit of a pure substance
- 11. the vertical column on the periodic table
- 13. element with the lowest atomic mass
Down
- 1. a particle with no charge found in the nucleus
- 2. a group of highly stable elements due to their full outer shell of electrons
- 4. the number of protons and neutrons with an atom
- 8. An element which has properties of both metals and non metals
- 12. positively charged particles found in the nucleus of an atom