Physical science 3

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Across
  1. 2. the number of protons in the nucleus of an element.
  2. 6. matter has no smallest part & could be divided indefinately
  3. 8. - When we put Elements in order by their Atomic number Chemical properties repeat in a pattern
  4. 11. Modern atomic theory
  5. 12. Law of conservation of ______- the amount of matter going into a Chemical reaction is equal to the amount of matter coming out
  6. 13. - did experiments weighing the Mass of the components & products of a reaction developing the law of conservation of mass
  7. 16. neutrons & protons have the same______ 1 AMU
  8. 17. gasses- Group IIIA. Do not bond with any atoms, glow when electricity goes through.
  9. 19. electrons- the outer shell electrons that are exchanged or shared to create Chemical Bonds.
  10. 21. contains Protons & neutions
  11. 22. Number of ____ =atomic mass -Atomic number
  12. 26. Very reactive gasses, Gr IIA, Create salts. Kills germs
  13. 29. -space where electrons are likely to be
  14. 30. Matter has I smallest piece and can't be divided further
  15. 31. postulated that there were multiple orbitals that electrons could travel in
  16. 32. Metals (Boron Group) Semiconductors Cuts down the amount of electricity (zig zag)
Down
  1. 1. elements Fire Air earth Water
  2. 3. discovered electrons (theorized there must be positive particles mixed in or it would repel of break apart).
  3. 4. negative in an orbital cloud.
  4. 5. - Developed the law of definate proportions
  5. 7. - Studied under thompson & built on his theory. the negative particles were like a shell with positive particles in the middle protons
  6. 8. Rows each is about the same size & Similar mass
  7. 9. Metals-very reactive, Group IIA. form Salts that can be broken by organic processes.
  8. 10. metals - most reactive, burn in Water Gr IA Create salts that are very stable.
  9. 14. group ITA-VIA insulators
  10. 15. Scientist who Ist developed the Periodic Table
  11. 18. discovered Neutrons under Rutherford's teaching.
  12. 20. Law of _______ of matter - Matter cannot be created or destroyed
  13. 23. Law of constant _____- Compounds of the same substance will always have the ratio of atoms H₂O, CO2, NaCl, Ca Hiz On
  14. 24. Groups with a B + the elements to the left of the zig zag line going from Aluminum to Bis moth Malleable, conduct electricity & heat
  15. 25. Atoms of the same element with different numbers of Neutrons.
  16. 27. the sum of masses of protons, neutrons and electrons.
  17. 28. Columns each has the same chemical properties