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5 Written questions

5 Matching questions

  1. How many of the 90 naturally- occuring elements are used by living organisms?
  2. What are the three types of chemical bonds?
  3. What is a neutron?
  4. What is a polar molecule?
  5. What makes up the nucleus?
  1. a Protons and neutrons.
  2. b 25.
  3. c Ionic
  4. d an electronically neutral subatomic particle.
  5. e a molecule that has opposite charges on opposite ends.

5 Multiple choice questions

  1. The number of electrons in the outermost shell.
  2. Substances that cannot be broken down into other substances.
  3. 2.
  4. up to 8 electrons.
  5. A subatomic particle w/ a negative charge.

5 True/False questions

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


  2. The tendency of water molecules to stick to each other is calledcohesion


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


  4. What determines which element it is?Substances that cannot be broken down into other substances.


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


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