Chemistry

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Across
  1. 2. Negatively charged and found in all atoms
  2. 4. The total number of protons and neutrons in an atom
  3. 6. A special block of metalic elements with atomic numbers 90-103
  4. 7. Negativity charged ion
  5. 9. Also known as electron shells
  6. 13. The centre of an object
  7. 18. Attraction of positive and negative ions
  8. 19. In group 18
  9. 22. A special block of metalic elements from group 3-12
  10. 25. What represents an atom
  11. 27. An electron that can participate in the formation of a chemical bond
  12. 31. A particle representing a quantum of light or other electromagnetic radiation
  13. 32. A group of atoms formed by elections being transferred from one atom to another
Down
  1. 1. The idea that electrons orbit around the nucleus at set distances
  2. 3. A special block of metalic elements on the periodic table with atomic numbers 58-71
  3. 5. A particle that makes up all material
  4. 8. Found in all atoms but has no charge
  5. 10. The lowest energy arrangement of an atoms electrons
  6. 11. Positively charged ion
  7. 12. Another term for semimetal
  8. 14. Arrangement of electrons in an electron shell
  9. 15. Surrounds the nucleus of an atom
  10. 16. A state of a physical system that is higher in energy than the ground state
  11. 17. The out most shell of an atom
  12. 20. Horizontal rows on the periodic table
  13. 21. Group 17 elements
  14. 23. Different forms of the same element
  15. 24. Group 1 elements
  16. 26. The number of protons in an atom
  17. 28. A substance composed of atoms with the same atomic number
  18. 29. Something that is composed of two or more elements
  19. 30. A column in the periodic table