Abeka Physical Science Ch. 12 & 13

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Across
  1. 3. A single piece of semiconductor containing an entire electronic circuit.
  2. 4. The number system based on powers of sixteen.
  3. 6. The type of element found in the first column of the periodic table.
  4. 8. The separation of charges by light is called the _____________ effect.
  5. 11. The process that occurs when an atom splits into two smaller atoms.
  6. 13. The production of electric current in a vacuum using a heated cathode is ___________ emission.
  7. 14. Scientists believe that protons and neutrons are composed of smaller particles called __________.
  8. 16. The first general-purpose electronic computer.
  9. 20. The overall motion of each electron can be mathematically represented by four _________ numbers.
  10. 22. The type of nuclear decay that causes the ejection of two protons and two neutrons from the nucleus of an atom.
  11. 24. This allows the "brain" of a computer to store information temporarily.
  12. 25. Cathode rays are actually streams of _________.
  13. 27. The principle stating that it is impossible to know both the position and velocity of an electron simultaneously.
  14. 30. The study of the behavior of electrons in a vacuum or in special materials.
  15. 31. A simple vacuum tube consisting of two electrodes that allow current to flow in only one direction is called a(n) __________.
  16. 32. John Dalton proposed that all matter consists of tiny particles called ___________.
  17. 34. A semiconductor device that can act as a switch and amplify weak signals.
  18. 35. The type of radiation which consists of electromagnetic waves of extremely high frequency and energy.
  19. 38. The general term for a device used for long-term storage of information.
  20. 39. A material that is neither a good conductor nor a good insulator.
Down
  1. 1. The Crookes tube is an example of a(n) _______ tube.
  2. 2. The actual physical components of a computer.
  3. 5. A device that produces a single binary output based on one or more binary inputs.
  4. 7. The positive electrode of a vacuum tube.
  5. 9. This is considered the "brain" of the computer.
  6. 10. According to the electron-cloud model, electrons move unpredictably through regions of space called ________.
  7. 12. This allows the "brain" of a computer to communicate.
  8. 15. The term that refers to data that can represent only certain values within a range.
  9. 17. Substances composed of a single type of atom.
  10. 18. Graphite and diamond are forms of _________.
  11. 19. The outermost electron shell contains ________ electrons.
  12. 21. Each element is given an abbreviation called a(n) _________.
  13. 23. The measure of the rate of radioactive decay.
  14. 26. The subatomic particle that has a positive charge.
  15. 28. Atoms of the same element that have a different number of neutrons are __________ of that element.
  16. 29. A group of computers linked together electronically, allowing information to be shared among them.
  17. 33. The total number of protons and neutrons in an atom is its _____________.
  18. 36. Most of the elements are hard, dense, shiny solids called ___________.
  19. 37. A row on the periodic table of elements is a ___________.