Atomic Structure Vocab Review

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Across
  1. 2. Positively charged subatomic particles.
  2. 4. Negatively charged subatomic particles.
  3. 5. An element or substance that is not a metal.
  4. 8. Metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive.
  5. 10. Vertical column on the periodic table.
  6. 11. Horizontal rows on the periodic table.
  7. 14. Electrons in the outermost shell of an atom.
  8. 16. Contains Nonmetals, 7 valence electrons in its outermost energy level. Very reactive.
  9. 19. The number of protons and electrons in the nucleus of an atom.
  10. 20. Group 1. 1 electron in outer level, very reactive.
  11. 21. Particles of the nucleus that have no charge.
  12. 22. Elements in group 18 of the periodic table that are chemically stable.
Down
  1. 1. Group 3 metals on the periodic table.
  2. 3. a region around the nucleus of an atom where electrons are found.
  3. 6. Atoms of the same element that have different numbers of neutrons.
  4. 7. The sum of the number of neutrons and protons in an atomic nucleus.
  5. 9. the weighted average of the atomic masses of the naturally occurring isotopes of an element.
  6. 12. Energy levels where the electrons are found.
  7. 13. Elements that are good conductors of electric current and heat.
  8. 15. Elements that form a bridge between elements on the left and right sides of the periodic table Groups 3-12.
  9. 17. Center of an atom
  10. 18. Elements with properties that fall between those of metals and nonmetals.
  11. 19. Smallest particle of an element that still has the properties of that element.