Matter and more

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Across
  1. 2. the amount of particular substances contained within a solution/mixture or in a particular volume/space
  2. 5. the positively charged central region of an atom
  3. 7. the total number of protons and neutrons in an atomic nucleus
  4. 9. an element that has properties that are intermediate between those of metals and nonmetals
  5. 13. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
  6. 14. any of the elements lithium, sodium, potassium, rubidium, caesium, and francium, occupying Group IA (1) of the periodic table
  7. 15. a table of the chemical elements arranged in order of atomic number
  8. 17. the body of theory which explains the physical properties of matter in terms of the motions of its constituent particles
  9. 19. process by which particles spread
  10. 20. a notation of one or two letters representing a chemical element
  11. 22. a group of atoms held together by covalent bonds
  12. 23. a chemical element that mostly lacks the characteristics of a metal
  13. 24. the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules
  14. 25. a vertical column in the Periodic Table
  15. 27. the smallest unit into which matter can be divided without the release of electrically charged particles
Down
  1. 1. a small portion of matter
  2. 3. smaller than or occurring within an atom.
  3. 4. an element that readily forms positive ions
  4. 6. any of the six chemical elements that comprise Group 2 (IIa) of the periodic table
  5. 8. the fundamental materials of which all matter is composed
  6. 10. an admixture of metals
  7. 11. the name given to a horizontal row of the periodic table
  8. 12. any substance that has mass and takes up space by having volume
  9. 13. the capacity for doing work
  10. 16. a substance that contains atoms of two or more different elements that are chemically joined together
  11. 18. a group in the periodic table consisting of five chemically related elements
  12. 21. a subatomic particle of about the same mass as a proton but without an electric charge
  13. 26. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron