Ch 2 Review 8th Grade Science

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Across
  1. 4. The subatomic particle that is indicated by the atomic number of that element.
  2. 7. The name for the forces of attraction between molecules.
  3. 8. The type of bond formed when positive ions are attracted to negative ions.
  4. 9. The most reactive halogen.
  5. 12. The term for the combined total of protons and neutrons in the nucleus of an atom.
  6. 15. This is how many electrons an atom of sodium has available for forming bonds.
  7. 17. The term for a particle that has an unequal number of protons and electrons.
  8. 18. Diamond and graphite are examples of this type of covalent structure.
  9. 19. The name used to describe giant structures whose particles are arranged in a regular repeated pattern.
  10. 20. The subatomic particle involved in forming bonds between atoms.
  11. 23. Atoms form bonds with each other in order to become more ________.
  12. 25. The name for the forces that keep the electrons from flying off and away from the nucleus.
  13. 27. The name given to a substance containing atoms of two or more different elements that are bonded together.
  14. 28. This is the maximum number of electrons the first energy shell can hold.
  15. 29. This is the maximum number of electrons the third energy shell can hold.
Down
  1. 1. This type of bond tends to form between two nonmetal atoms when they share electrons.
  2. 2. On a square of the periodic table, the number at the top of the box is known as the _____ number.
  3. 3. Calcium atoms have electrons in __________ energy levels.
  4. 5. Atoms of this element have the electron structure 2,8,6.
  5. 6. This is the name for a row on the periodic table.
  6. 7. This type of bond is due to the attraction of positive ions and negative ions.
  7. 10. The group on the periodic table that are stable and don't thus don't form compounds.
  8. 11. The overall charge of an ion with more protons than electrons.
  9. 13. The overall charge of the particle formed when an atom gains electrons.
  10. 14. Oxygen, carbon dioxide, and water are all examples of ______, which are simply particles formed when atoms covalently bond with each other.
  11. 16. This is found in the center of an atom and contains pretty much all of the atom's mass.
  12. 21. The name for a positive ion.
  13. 22. This is the name for a column on the periodic table.
  14. 24. This is the name for the group on the periodic table that contains the most reactive metals.
  15. 26. The name for a negative ion.