CHEMISTRY

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Across
  1. 5. a miniature solar system
  2. 8. very stable and not reactive
  3. 9. a measure of the full of gravity of the earth in a body
  4. 11. Group or family
  5. 12. left side of the periodic table
  6. 13. distance from the nucleus to the last energy level
  7. 15. smallest estimated value
  8. 17. good element of a body
  9. 22. mass of substance per unit volume
  10. 24. transition element and it is in the middle of the periodic table
  11. 26. refers to the number of protons equal to number of electrons
  12. 27. retain only 1 uncertain digit
  13. 28. rare earth elements
  14. 29. salt-form
Down
  1. 1. number plus unit correct of significant figure
  2. 2. wherein substance can believe as acid or base at the same time
  3. 3. form strong bases
  4. 4. refers us to the number of exact digits plus one digit which is estimated
  5. 6. right side of the periodic table
  6. 7. organized, systematic arrangement of known elements based on INCREASING atomic number
  7. 10. building blocks of element
  8. 14. amount of matter in an object
  9. 15. responsible if condition is maintained
  10. 16. expansion due to increase kinetic energy of molecule
  11. 18. zero all molecular motion are dead
  12. 19. combining of two or more elements in definite combination or ratio
  13. 20. constant composition
  14. 21. a negatively charged subatomic particle
  15. 23. a pure substance that cannot be broken down into simpler substance by a chemicalreaction
  16. 25. smallest exact digit or line which is taken directly from device