Physical Science Midterm

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Across
  1. 2. the numbers that appear before a formula
  2. 5. a chemical reaction that releases energy to is surroundings
  3. 10. a notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound
  4. 15. an atom that has a net positive or negative electric charge
  5. 16. an eletron that is in the highest occupied energy level
  6. 18. a reaction in which two or more substances react to form a single substance
  7. 20. a chemical bond in which two atoms share a pair of valence electrons
  8. 21. each row in the periodic table of elements
  9. 22. a positively charged subatomic particle that is found in the nucleus of an atom
  10. 23. a reaction in which two different compounds exchange positive ions and form two new compounds
  11. 25. a neutral subatomic that is found in the nucleus of an atom
  12. 26. new substances that are formed as a result of a chemical reaction
  13. 27. atoms of the same element that have different numbers of neutrons and different mass numbers
  14. 28. a neutral group of atoms that are joined together by one or more covalent bonds
  15. 29. elements with proterties that fall between those of metals and nonmetals
  16. 31. the force that holds cations and anions together
  17. 32. each column in the periodic table of elements
Down
  1. 1. a reaction in which one element takes the place of another element in a compound
  2. 3. a reaction in which a compound breaks down into two or more simpler substances
  3. 4. equals the number of protons in an atom
  4. 6. dense positively charged mass located in the center of the atom
  5. 7. a representation of a chemical reaction in which the reactants and products are expressed as formulas
  6. 8. an ion wih a positive charge
  7. 9. a covalent bond in which electrons are not shared equally
  8. 11. the force that holds atoms or ions together as a unit
  9. 12. the sum of the protons and neutrons in the nucleus of an atom
  10. 13. the substances that undergo change
  11. 14. elements that are poor conductors of heat and electric current
  12. 17. a covalently bonded group of atoms that has a positive or negative charge and acts as a unit
  13. 19. a negatively charged subatomic particle that is found in the space outside the nucleus
  14. 24. a chemical reaction that absorbs energy from its surroundings
  15. 29. elements that are good conductors of electric current and heat
  16. 30. an ion with a negative charge