Matter and the Periodic Table Puzzle

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