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5 Written questions

5 Matching questions

  1. What are isotopes?
  2. What are the three types of chemical bonds?
  3. How many of the 90 naturally- occuring elements are used by living organisms?
  4. What is an electron?
  5. The bond between the hydrogen atom of one water molecule and the oxygen atom of another water molecule is made possible by
  1. a Elements that exist in different forms
    Forms of an element that differ in mass
    Same num of protons and electrons but diff num of neutrons
  2. b A subatomic particle w/ a negative charge.
  3. c Ionic
    Covalent
    Hydrogen
  4. d 25.
  5. e the polarity of the water molecule

5 Multiple choice questions

  1. an electronically neutral subatomic particle.
  2. A subatomic particle w/ a single unit of positive electrical charge (+)
  3. Substances that cannot be broken down into other substances.
  4. The sum of the number of protons and neutrons in its nucleus.
  5. is one in which the nucleus decays, giving off particles of energy.

5 True/False questions

  1. What is a molecule?a molecule that has opposite charges on opposite ends.

          

  2. What is a hydrogen bond?Forms when 2 atoms share 1 or more pairs of outer shell electrons and forms a molecule.

          

  3. The number of shells an atom has depends on what?the number of electrons it has.

          

  4. What is an atom?The smallest unit of matter that still retains the properties of an element.

          

  5. How many electrons can the inner shell of an atom hold?up to 8 electrons.

          

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