Ch 2

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Across
  1. 2. A type of chemical bond where two atoms share one or more pairs of valence electrons.
  2. 5. The number of protons in the nucleus of an atom (no space between words).
  3. 6. Anything that has mass and takes up space.
  4. 7. Atoms or molecules that have gained or lost one or more electrons, giving them a net electrical charge.
  5. 9. A covalent bond in which the electrons are shared equally between the two atoms (no space between words)..
  6. 11. A weak bond that forms between a partially positive hydrogen atom and a partially negative atom, typically oxygen or nitrogen.
  7. 14. A chemical bond formed by the electrostatic attraction between oppositely charged ions.
  8. 15. The starting substances in a chemical reaction.
  9. 16. The substances that are formed as a result of a chemical reaction.
  10. 19. The elements that an organism needs to live a healthy life and reproduce.
  11. 21. Elements that are essential for life but are required in very small quantities.
  12. 23. The electrons in the outermost shell of an atom, which are involved in chemical bonding.
  13. 24. A negatively charged ion.
Down
  1. 1. The total mass of the protons, neutrons, and electrons in a single atom (no space between words)..
  2. 3. A chemical reaction that proceeds in only one direction.
  3. 4. A covalent bond in which the electrons are shared unequally between the two atoms, creating a partial positive and partial negative charge on the atoms (no space between words)..
  4. 8. A positively charged ion.
  5. 10. Subatomic particles located in the nucleus of an atom that have a positive electrical charge.
  6. 12. Subatomic particles located in the nucleus of an atom that have no electrical charge.
  7. 13. The four most abundant elements in living organisms: carbon (C), hydrogen (H), oxygen (O), and _________________________.
  8. 15. A chemical reaction that can proceed in both the forward and reverse directions.
  9. 17. The sum of the atomic masses of all the atoms in a molecule (no space between words)..
  10. 18. Negatively charged subatomic particles that orbit the nucleus of an atom.
  11. 20. A pure substance that consists of only one type of atom.
  12. 22. The smallest unit of an element that retains the chemical properties of that element.