Unit 5 - Atoms And Periodic Table

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Across
  1. 2. the basic unit of a chemical element.
  2. 4. a positively charged ion
  3. 6. mass total mass of protons and neutrons in an individual atom
  4. 8. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb),tellurium (Te), polonium (Po) and astatine (At)
  5. 11. a negatively charged ion
  6. 13. negative electric charge
  7. 15. symbol a notation of one or two letters representing a chemical element.
  8. 17. a substance that cannot be broken down into simpler components
  9. 18. an uncharged particle
  10. 20. positive electric charge
  11. 21. a column of elements in the periodic table
Down
  1. 1. a column of elements in the periodic table of the chemical elements.
  2. 3. -an element that forms positive ions
  3. 5. regions of space around the nucleus of an atom where an electron is likely to be found.
  4. 7. - a chemical element that lacks the characteristics of a metal
  5. 9. atom with a net electric charge due to the loss or gain of one or more electrons.
  6. 10. bond a chemical bond that involves the sharing of electron pairs between atoms
  7. 12. the central part of most cells that contains protons and neutrons
  8. 14. horizontal row of the periodic table.
  9. 16. a form of a chemical element whose atomic nucleus contains a specific number of neutron
  10. 19. bond when a positively charged ion forms a bond with a negatively charged ions and one atom transfers electrons to another.