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5 Written questions

5 Matching questions

  1. What is an electron?
  2. What physical states is matter found in?
  3. How many of the 90 naturally- occuring elements are used by living organisms?
  4. What are isotopes?
  5. What is a polar molecule?
  1. a A subatomic particle w/ a negative charge.
  2. b Solid
    Liquid
    Gas
  3. c a molecule that has opposite charges on opposite ends.
  4. d 25.
  5. e 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

5 Multiple choice questions

  1. the atomic number.
  2. The smallest unit of matter that still retains the properties of an element.
  3. A compound held together by ionic bonds.
  4. The sum of the number of protons and neutrons in its nucleus.
  5. Atoms held together by covalent bonds.

5 True/False questions

  1. What is the atomic number?The number of protons in an atom.

          

  2. The number of covalent bonds an atom can form is equal to what?the number of electrons it has.

          

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

          

  4. What is a radioactive isotope?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

          

  5. What is matter?Anything that has mass and occupies space.