Across
- 1. atoms that change over time
- 5. the scale used to compare the electronegativity of atoms
- 6. pure substances made from a single type of atom
- 7. a column on the periodic table
- 8. an atom or molecule's ability to attract electrons
- 13. when a single compound breaks down into 2 or more smaller products
- 14. an exothermic chemical reaction
- 18. the central zone of atoms
- 19. a bunch of atoms bonded together
- 21. electrons in the outer shell of an atom
- 22. subatomic particles with a positive charge
Down
- 2. the arrangement of electrons in the shell
- 3. when 2 or more substances combine
- 4. a molecule containing over 2 types of atoms
- 5. scale measures acids and bases
- 6. subatomic particles with a negative charge
- 9. when elements/compounds rearrange themselves in an equation
- 10. occur when the nucleus loses or gains a neutron
- 11. is neutralised by bases
- 12. the founder of modern atomic theory
- 15. chemicals that change colour when added to an acid or base
- 16. the most electronegative element on the Pauling Scale
- 17. a row on the periodic table
- 18. subatomic particles with no charge
- 20. chemical particle that retains the particle's properties