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5 Written questions

5 Matching questions

  1. What is a radioactive isotope?
  2. What are isotopes?
  3. What is matter?
  4. What is a polar molecule?
  5. What is a chemical reactions?
  1. a is one in which the nucleus decays, giving off particles of energy.
  2. b 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
  3. c Anything that has mass and occupies space.
  4. d Changes is the chemical compound of matter.
  5. e a molecule that has opposite charges on opposite ends.

5 Multiple choice questions

  1. The number of protons in an atom.
  2. Oxygen, carbon, hydrogen, and nitrogen.
  3. Substances that cannot be broken down into other substances.
  4. The number of electrons in the outermost shell.
  5. The outer shell.

5 True/False questions

  1. What is a neutron?an electronically neutral subatomic particle.


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


  3. How many of the 90 naturally- occuring elements are used by living organisms?Oxygen, carbon, hydrogen, and nitrogen.


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


  5. What is mass?The sum of the number of protons and neutrons in its nucleus.