Elements and Bonds

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Across
  1. 2. a type of chemical bond formed when atoms share electron pairs
  2. 3. the smallest unit of an element that retains its properties
  3. 4. the layers around the nucleus where electrons are arranged
  4. 6. a chemical combination of different elements shown with symbols and subscripts
  5. 10. average mass of all an element’s isotopes, found on the periodic table
  6. 12. the tendency of an atom to attract electrons in a chemical bond
  7. 14. positively charged particles found in the nucleus of an atom
  8. 16. scale from 0 to 14 that measures how acidic or basic a solution is
  9. 17. a weak bond between polar molecules involving a hydrogen atom
  10. 18. forms of the same element with different numbers of neutrons
  11. 19. substances that reduce hydrogen ion concentration, often by releasing OH⁻
  12. 21. a homogeneous mixture where one substance is dissolved in another
  13. 24. tiny negatively charged particles orbiting the nucleus in energy levels
  14. 26. a bond with unequal sharing of electrons, creating slight charges
  15. 28. the total count of protons and neutrons in an atom’s nucleus
  16. 30. negatively charged particles that make solutions more basic
Down
  1. 1. the outermost electron shell that determines chemical reactivity
  2. 3. one or two letters that represent a chemical element on the periodic table
  3. 5. tightness at the surface of a liquid caused by cohesive forces
  4. 7. anything that takes up space and has mass, found in all physical substances
  5. 8. the substances dissolved in a solution, like salt in saltwater
  6. 9. a bond formed between oppositely charged ions due to electron transfer
  7. 11. a bond where atoms share electrons equally with no charge difference
  8. 13. atoms or molecules with an electric charge from losing or gaining electrons
  9. 15. a substance that helps maintain a stable pH in a solution despite added acids or bases
  10. 20. substances that release hydrogen ions in solution, lowering pH
  11. 22. positively charged particles that increase the acidity of a solution
  12. 23. uncharged particles located in the atomic nucleus, add to atomic mass
  13. 25. two or more atoms bonded together, can be the same or different elements
  14. 27. equals the number of protons in an atom and identifies the element
  15. 29. attraction between molecules of different types, like water and glass