Isotopes, Bohr, Lewis

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Across
  1. 4. How many valence electrons does Chlorine have?
  2. 7. An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate and round to hundredths place the average atomic mass of this element.
  3. 8. The electrons in the last energy level are called ________________ electrons.
  4. 10. The atomic number for Gallium is ___________.
  5. 13. Electrons have what charge?
  6. 14. Elements on the periodic table are arranged according to their number of ____________.
  7. 16. All elements on the periodic table have one or more __________________.
  8. 18. Neutrons have a ___________ charge.
  9. 20. The vertical columns on the period table are called __________.
  10. 21. The way chemists show the valence electrons of an element in pairs of electrons is called a _________________structure.
  11. 24. Elements in period 5 have how many energy levels?
  12. 26. Electrons are found in an area called the _____________________.
  13. 27. How many electrons does Tin have?
  14. 28. Elements in group 16 have how many valence electrons?
  15. 29. The elements on the periodic table that have a full last energy level and do not combine with other elements are called ________________________.
  16. 30. Ga - 67 has how many neutrons?
Down
  1. 1. When we write an isotope in this manner: X it is called ________________________.
  2. 2. In order to find the weighted atomic mass you would need to the know the __________________________ and _____________.
  3. 3. How many neutrons does Iodine have?
  4. 5. The rounded atomic mass for scandium is ______________.
  5. 6. Elements with the same number of protons but a different number of neutrons are called ____________.
  6. 8. The group numbers tell you the number of ________________ electrons.
  7. 9. When we write an isotope like this: C-13, it is called ______________.
  8. 11. The atomic mass for C - 13 is ________________.
  9. 12. Most of the mass of an atom is found in the _______________.
  10. 14. The horizontal rows on the period table are called ___________.
  11. 15. Protons have what charge?
  12. 17. What elements are found along the staircase on the periodic table.
  13. 19. The number of electrons in the second energy level is _______________.
  14. 22. Only ___________________ are involved in chemical reactions.
  15. 23. The number of electrons in the first energy level is __________.
  16. 25. Potassium has how many energy levels?