Physical science crossword puzzle

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Across
  1. 5. not able to be seen through; not transparent.
  2. 7. the number of the different atoms of elements on the reactants side is equal to that of the products side
  3. 9. the energy that an object has due to its motion
  4. 13. is neither created nor destroyed, so we must have the same number and type of atoms after the chemical change as were present before the chemical change
  5. 14. unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.
  6. 15. a negatively charged particle found outside the nucleus of an atom
Down
  1. 1. the sum of protons and neutrons in the nucleus of an atom
  2. 2. a one- or two-letter representation of an element on the periodic table
  3. 3. the central core of the atom made up of protons and neutrons
  4. 4. Change from a liquid to a solid
  5. 6. The basic particle from which all elements are made
  6. 8. atoms with the same number of protons and electrons, but a different number of neutrons.
  7. 10. elements in the same vertical column of the periodic table; also known as a 'family'
  8. 11. a mixture in which pure substances are unevenly distributed throughout the mixture; you can see the different parts (Ex: salad, soil)
  9. 12. change of state from a gas directly to a solid