the element crossword - green

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Across
  1. 3. what is the compound of two hydrogen and one oxygen?
  2. 5. is an electron that is associated with an atom.
  3. 10. what is famous of C?
Down
  1. 1. element is a species of chemical objects, chararacterized by a number of protons in atoms nucleus.
  2. 2. are the elements in groups 14-16 of the periodic table.
  3. 4. are the elements found along the step like line between metals and non-metals of the periodic table.
  4. 6. is the number of protons in an atom of an element.
  5. 7. this naturally occuring chemical compound is composed of a carbon atom covalently double bonded to two oxygen atoms.
  6. 8. what is famous in N2?
  7. 9. have a positive electric charge.