8.5 A-C: Atomic Structure and Periodic Table

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Across
  1. 3. a particle smaller than an atom; includes protons, neutrons and electrons
  2. 6. tendency of an atom to undergo changes
  3. 9. a material that is typically hard, shiny, malleable,and ductile, with good electrical and thermal conductivity; found on the left of the zigzag line with the exception of Hydrogen (nonmetal)
  4. 10. a model/chart in which elements are organized according to their properties and atomic number
  5. 11. a negatively charged particle in the electron cloud (energy shells/levels) surrounding the nucleus
  6. 12. tendency of a material to resist change or decomposition
  7. 15. the number of protons in the nucleus of an atom; used to determine an element’s identity and position on the Periodic Table
  8. 17. average mass of one atom of an element; protons and neutrons in the nucleus
  9. 19. the negatively charged space where electrons orbit/travel in energy shells/levels outside the nucleus
  10. 20. a positively charged particle in the nucleus used to identify the element
  11. 21. horizontal rows on the Periodic Table that indicate the number of energy shells (energy levels)
  12. 22. a pure substance that cannot be broken down chemically
  13. 23. a chemical element that exhibits some properties of metals and nonmetals; found on the zigzag line with the exception of Aluminum (metal)
Down
  1. 1. characteristics of substances that describes how they chemically bond to form new substances with different properties
  2. 2. the circular path followed by an electron outside (around) the nucleus
  3. 4. vertical columns on the Periodic Table that indicate the number of valence electrons
  4. 5. electron(s) located in the outermost energy shell (energy level)
  5. 7. the smallest particle of an element that maintains the properties of that element
  6. 8. the physical property of matter that causes it to experience a force when placed in an electromagnetic field
  7. 13. a chemical element that does not have the properties of a metal; found on the right of the zigzag line
  8. 14. the positively charged dense center of an atom that contains the protons and neutrons
  9. 16. the property of matter that can be observed without changing the composition or identity of the matter
  10. 18. a neutral particle with no electrical charge in the nucleus