Matter and the Periodic Table Puzzle

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