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5 Written questions

5 Matching questions

  1. The number of shells an atom has depends on what?
  2. What determines which element it is?
  3. How many of the 90 naturally- occuring elements are used by living organisms?
  4. What is ion?
  5. How many electrons can the 2nd and 3rd shell of an atom hold?
  1. a the atomic number.
  2. b The term for atoms that are electronically charged as a result of gaining/losing electrons.
  3. c up to 8 electrons.
  4. d 25.
  5. e the number of electrons it has.

5 Multiple choice questions

  1. The sum of the number of protons and neutrons in its nucleus.
  2. is one in which the nucleus decays, giving off particles of energy.
  3. A subatomic particle w/ a single unit of positive electrical charge (+)
  4. Oxygen, carbon, hydrogen, and nitrogen.
  5. a molecule that has opposite charges on opposite ends.

5 True/False questions

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

          

  2. What are the three types of chemical bonds?Ionic
    Covalent
    Hydrogen

          

  3. The bond between the hydrogen atom of one water molecule and the oxygen atom of another water molecule is made possible bythe polarity of the water molecule

          

  4. The number of covalent bonds an atom can form is equal to what?The number of additional electrons needed to fill its outer shell.

          

  5. What determines the chemical properties of an atom?the atomic number.