Periodic Table

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Across
  1. 3. Hydrogen is located in period ______ of the periodic table.
  2. 5. In the modern periodic table, elements are arranged according to their _______ number
  3. 8. The atomic number equals number of ________ in an atom.
  4. 10. Cu
  5. 12. Person who wrote the first periodic table
  6. 14. Elements in Groups 3-12 are called _________ metals.
  7. 16. What state of matter are carbon, lead, and aluminum?
  8. 17. A substance with unique properties that is composed of only 1 type of atom is called a(n) _______
  9. 19. Columns of the Periodic Table
Down
  1. 1. Element with 20 protons
  2. 2. Most abundant element in air
  3. 4. He, Ne, Ar, Kr, Xe, Rn are ________ gases
  4. 6. Alkaline Earth Metals have how many valence electrons
  5. 7. An element is a substance composed of a single kind of _______
  6. 9. Chlorine has _______ number of neutrons
  7. 11. Rows of the Periodic Table
  8. 13. Element with an atomic number of 47
  9. 15. Shiny, highly conducting solids such as sodium, tin, and lead
  10. 18. The symbol for the element Mercury is ______