Periodic Crossword

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Across
  1. 2. A group of two or more atoms held together by chemical bond.
  2. 4. two Hydrogen and Oxygen
  3. 6. has properties of dull.
  4. 7. Vertical columns
  5. 10. the number of protons in the nucleus of atom is the________.
  6. 11. An arrangement of elements showing the repeating pattern
  7. 14. Small region in the center of Bohr model.
  8. 16. opposite traits of Metals.
  9. 17. The elements in a column form is a _ _ _ _ _.
  10. 18. A pure substance that cannot be broken down into any other substances.
  11. 20. Li
Down
  1. 1. It has positively charged particles.
  2. 3. The letter below the atomic number.
  3. 5. The basic building block of matter.
  4. 8. The number under the Chemical Symbol.
  5. 9. the horizontal line on the periodic table.
  6. 12. Contain negative charged particle.
  7. 13. It has no electric charge.
  8. 15. share properties of both metals and nonmetals.
  9. 19. has the character of Shiny,And malleable.