Across
- 3. the person who concluded that cathode rays were negatively charged particles.
- 5. the ability of the atom to attract toward itself the electrons in a chemical bond
- 6. changes that do not change the composition
- 7. elements in Group 8A
- 9. electrons in the outermost energy level of an atom
- 10. the person who arranged the elements by atomic numbers
Down
- 1. the person who proposed 'atomos'
- 2. atoms that have the same atomic number but different number of neutrons
- 4. irreversible process of change
- 8. elements that have the properties of metals and nonmetals