Matter and the Periodic Table Puzzle

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Across
  1. 5. I am made up of hydrogen and oxygen atoms and you need me to live.
  2. 6. I am a transition metal with 47 electrons used to make photographic film.
  3. 8. The number of _______ gives the identity of an element.
  4. 10. My atomic mass is 63.546 amu.
  5. 12. I am one of the noble gases.
  6. 15. I take the shape of the container I am in.
  7. 17. A combination of two or more atoms held together in a specific shape by attractive forces.
  8. 18. Two forms of the same element that contain same number of protons but different number of neutrons.
  9. 20. I have no charge and you can find me at the center of an atom.
  10. 21. Arsenic is an example of this type of element.
  11. 22. Elemental symbol for tin.
  12. 23. My atomic number is 7.
  13. 24. I have definite shape and volume.
Down
  1. 1. Another name for a column of the periodic table.
  2. 2. Members of Group 17 (or VIIA) are called _______.
  3. 3. Electrons furthest from the nucleus that are responsible for interactions of atoms with one another also referred to as _________ electrons.
  4. 4. Another name for a row of the periodic table.
  5. 6. You can find me in Group 1 of the periodic table and in table salt.
  6. 7. I am the heaviest alkaline earth metal.
  7. 9. Protons, neutrons and electrons are classified as ________ particles.
  8. 11. If phosphorus gains 1 proton it turns into this element.
  9. 13. Substance that contains more than one element.
  10. 14. I am negatively charged and barely contribute to the mass of the atom.
  11. 16. These types of elements are malleable, ductile and conduct electricity.
  12. 19. I can be either heterogeneous or homogeneous.
  13. 20. I am the positively charged center of an atom.
  14. 25. An atom that has gained or lost one or more electrons.