Across
- 3. an atom that gains or loses an electron and becomes electrically unbalanced
- 6. number of protons and neutrons in the nucleus.
- 8. carry no electrical charge.
- 10. substances made up of only one type of atom.
Down
- 1. carry positive electrical charges.
- 2. anything that occupies space and mass.
- 4. atom equal number of protons (positive charges) and electrons (negative charges)
- 5. fundamental unit of matter.
- 7. negatively charged particles.
- 9. dense core of an atom has 2 parts, protons and neutrons.