Atomic Structure and the Periodic Table

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Across
  1. 3. Although this element is in a group with metals, it is a nonmetal.
  2. 5. protons and ________________ are found in the nucleus
  3. 6. This element has an average atomic mass of 40.078 amu.
  4. 11. The mass number of an atom is found by adding __________ and neutrons.
  5. 12. Lithium-7 would have how many neutrons? (Write out the number.)
  6. 13. Group 18 is called the ________ gases.
  7. 14. What main subatomic particle has no charge?
  8. 16. In order for an atom to be neutral the number of ____________ must be equal to the number of protons.
  9. 18. The atomic number is always equal to the number of _________________.
  10. 19. This is the last element in the alkali metals group.
  11. 24. Is cerium a lanthanide or actinide?
  12. 26. Is neon a metal, nonmetal, or metalloid?
  13. 28. protons have a ___________ charge
  14. 31. These elements are on the right side of the periodic table.
  15. 33. Is strontium a metal, nonmetal, or metalloid?
  16. 35. The current periodic table arranged elements by increasing _____________ number.
  17. 38. These elements are on the stairstep on the periodic table.
Down
  1. 1. Is thorium a lanthanide or actinide?
  2. 2. This element has an atomic number of 30.
  3. 3. Group 17 is called the _____________.
  4. 4. Isotopes are atoms of the same element with different numbers of ________________.
  5. 7. This element has 54 protons.
  6. 8. A helium atom has this many protons. (Write out the number.)
  7. 9. On the periodic table, the vertical columns are called __________ or families.
  8. 10. Beryllium has how many protons? (Write out the number.)
  9. 11. On the periodic table, the horizontal rows are called ____________.
  10. 15. Magnesium-26 would have how many neutrons? (Write out the number.)
  11. 17. This element has 24 protons.
  12. 20. This element has 12 protons.
  13. 21. A neutral atom of this element would have 50 electrons.
  14. 22. A neutral atom of this element would have 47 electrons.
  15. 23. Is boron a metal, nonmetal, or metalloid?
  16. 25. Groups 3-12 are called the ___________ metals.
  17. 27. How many protons does a neon atom have? (Write out the number.)
  18. 29. electrons have a ___________ charge
  19. 30. These elements are on the left side of the periodic table.
  20. 32. This element has an average atomic mass of 55.845 amu.
  21. 34. Group 2 is called the ___________ earth metals.
  22. 36. This is the first element in the noble gases group.
  23. 37. Group 1 is called the ___________ metals.