2nd quarter - Science Review

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Across
  1. 4. a state of matter in which atoms have been stripped of their electrons
  2. 10. Group 2a elements; 2 V.Es and very reactive with water
  3. 14. A + ion
  4. 15. An atom that has a net +/- electric charge
  5. 16. One 12th the mass of a carbon-12 atoms
  6. 19. A penetrating ray of energy emitted by an unstable nucleus
  7. 20. Elements that are the opposite of metals are called...
  8. 21. The process in which an unstable atomic nucleus emits charged particles
  9. 26. A covalent bond where electrons are shared equally
  10. 27. Rows of the periodic table are called...
  11. 28. Columns of the periodic table are called...
  12. 29. A notation that shows the elements and the ratio of ions
  13. 30. Who made the first version of the periodic table
  14. 33. An electron enutted by an unstable nucleus
  15. 35. The smallest possible mass of a fissionable material that can maintain a chain reaction
  16. 36. Elements that are good conductors of heat are called...
  17. 37. A model of an atom in which 1 dot = 1 V.E
  18. 38. A neutral group of atoms are joined together by 1 or more covenlent bonds
  19. 39. Compounds that are made with two nonmetals
Down
  1. 1. Nuclear radiation that appears naturally
  2. 2. A process in which the nuclei of 2 atoms combine to form a larger nucleus
  3. 3. Holds ions together as a unit
  4. 5. Group 1a elements; have a single V.E and are very reactive
  5. 6. A covalently bonded group of atoms that have a +/- charge & acts as a unit
  6. 7. the time required for one half of a sample of a radioisotope to decay
  7. 8. The attractive force that binds protons and neutrons together in the nucleus
  8. 9. Elements that are in between metals and nonmetals properties are called...
  9. 11. Group 8a elements; 8 V.Es (other than 1), colorless, oderless, very unreactive
  10. 12. Holds ions together when electrons are shared
  11. 13. Any atom containing an unstable nucleus
  12. 14. Soilds whose particles are arranged in a lattice structure
  13. 17. A covalent bond where electrons are not shared equally
  14. 18. An arrangement of elements in rows and columns
  15. 20. Charged particles and energy that are emitted from the nuclei of radioisotopes
  16. 22. An electron that is in the highest occupied energy level
  17. 23. A - ion
  18. 24. Group 7a elements; 7 V.Es, nonmetals, unreactive
  19. 25. Compounds made with at least 1 metal
  20. 31. A chemicla bond where two atoms share valence electrons
  21. 32. The splitting of an atomic nucleus into 2 smaller parts
  22. 34. A positivley charged particle made of 2 protons and 2 neutrons