physical science 3

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Across
  1. 3. __________________________________ a Chart of all elements in order of their atomic numbers
  2. 6. _____________________________bonds - 2 ori atoms share electrons equally between them them.
  3. 9. __________________________________ -group ta they are gasses that form -1 ions and are very reactive. (they kill bacteria)
  4. 11. Law of ________________________________________- pure compounds always have the same elements and proportion. (proven by Joseph Proust)
  5. 12. __________________________________ group ba - Plon metals Solids except Oxygen can form both covalent bonds or a-2 ion
  6. 14. __________________________________ a neutral particle in the center of an atom
  7. 16. __________________________________ metals-grouplA Most reactive metals burn in water and create strong ionic bonds with halogens.
  8. 17. the atomic mass from the atomic number
  9. 18. Electrons - Electrons in the outer orbital level (these are the ones that take part in Chemical bonds)
  10. 20. Law of ________________________________________ - matter cannot be created or destroyed but it can change forms (proven by Antonie Lavoisier)
  11. 23. __________________________________ - Atomic mass - Atomic humber
  12. 24. __________________________________ - 2 atoms with the same number of protons but different numbers of neutrons
  13. 25. __________________bonds. I or more electrons are taken from atom & given to another forming 2 Charged atoms that attract strongly
  14. 27. __________________________________ - the number of protons in each atom
  15. 29. __________________________________ model the center is positive with negative particles in orbit around it.
  16. 33. __________________________________ - elements in a column with similar Properties but identical ways of interacting in a chemical reaction.
  17. 34. __________________________________ - group 8A they are gasses that will not bond with anything (glow with electricity)
  18. 36. __________________________________ the center of an atom.
  19. 37. __________________________________ - metalloids that limit the amount of electricity that flows through them.
Down
  1. 1. __________________________________ -group 4A - Usually form covalent bond's some allow conduction of electricity Can Sometimes form ionic bonds
  2. 2. __________________________________ & Actinide Series - Very large atoms with metallic properties but are radioactive
  3. 4. __________________________________ - the sum of the protons and neutrons =#p+#n
  4. 5. __________________________________ a negative charged particle in orbit around the middle
  5. 7. Plumb pudding model - ____________________________ thought the atom was positively charged with small negative particles in it.
  6. 8. __________________________________ - group 3A-metals with lower melting Points
  7. 10. __________________________________ a positive charged particle in the middle of an atorm
  8. 13. __________________________________ - elements in the row with similar Sized atoms and in the same range of masse
  9. 15. __________________________________ model - a model that Sets apart areas where the electrons are most likely to travel.
  10. 19. __________________________________ - all B groups - Are metals that are good conductors, malleable, and higher melting points they have 1-2 valence electrons that they lose easily
  11. 21. __________________________________ -group 5A Solids except nitrogen Contains Non metals, metals and Semiconductors
  12. 22. _______________- a charged atom that has gained or lost I or more electron
  13. 26. came up with the first modern atomic theory
  14. 28. __________________________________ (ancient greek scientist) there is a smallest piece of matter you can have that Cannot be divided further. He thought there were 4 elements Earth, fire, Air and water.
  15. 30. __________________________________ - the space around a nucleus where electrons are most likely to be moving.
  16. 31. Dmitri __________________________________ 1869 a russian Scientist who first put elements in order by their atomic mass and discovered properties repeat periodically
  17. 32. __________________________________ - Scientist who came up with the theory that electrons are found in energy levels within their orbitals. * Closer to the nucleus the lower the energy level
  18. 35. __________________________________ metals- group 2 A they form +2 ions and almost always fomd in Ionic Compounds. Very Reactive."