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5 Written questions

5 Matching questions

  1. The number of shells an atom has depends on what?
  2. What is mass?
  3. What is a proton?
  4. What are the 4 most abundant elements in living cells?
  5. How many of the 90 naturally- occuring elements are used by living organisms?
  1. a Oxygen, carbon, hydrogen, and nitrogen.
  2. b The sum of the number of protons and neutrons in its nucleus.
  3. c A subatomic particle w/ a single unit of positive electrical charge (+)
  4. d the number of electrons it has.
  5. e 25.

5 Multiple choice questions

  1. Electrons.
  2. The term for atoms that are electronically charged as a result of gaining/losing electrons.
  3. 2.
  4. A compound held together by ionic bonds.
  5. a molecule that has opposite charges on opposite ends.

5 True/False questions

  1. The tendency of water molecules to stick to each other is calledthe number of electrons it has.


  2. What is an ionic bond?The attraction btwn opposite charged ions.


  3. What is a radioactive isotope?is one in which the nucleus decays, giving off particles of energy.


  4. What is a neutron?A subatomic particle w/ a negative charge.


  5. The bond between the hydrogen atom of one water molecule and the oxygen atom of another water molecule is made possible bycohesion


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