Matter and the Periodic Table Puzzle

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