hozie is the shis

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Across
  1. 5. charge equal in magnitude to that of an electron, but of opposite sign.
  2. 8. A chemical reaction that absorbs heat
  3. 10. Earth metals group 2 elements in the periodic table their reactivity is not as strong as alkali metals
  4. 11. Oxygens Chemical symbol
  5. 13. Hydrogens symbol
  6. 14. The basic unit of a chemical element
  7. 16. A substance that is made up of one kind of matter, which has a unique set of properties
  8. 17. A combo of elements
  9. 18. A change when a new substance is made
  10. 22. A reaction where all the products will remain and be accounted for
  11. 24. Mass of one element calculated from the total number of protons and neutrons
Down
  1. 1. A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  2. 2. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  3. 3. Number of protons in the nucleus of one atom of an element
  4. 4. A change in appearance
  5. 6. A chemical reaction that releases heat
  6. 7. a element that has both metallic and nonmetallic properties
  7. 9. the most reactive of all elements
  8. 11. A reaction where some of the products can be lost
  9. 12. metals Group 1 elements in the periodic table not including hydrogen most reactive
  10. 15. a substance that helps a chemical reaction to proceed more quickly
  11. 19. Hydrogens Chemical symbol
  12. 20. Group 18 elements in the periodic table
  13. 21. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
  14. 23. Water's chemical formula