Elementary Matter
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Questions and Answers

What is the atomic number of the element with 19 protons?

  • 20
  • 18
  • 21
  • 19 (correct)
  • Which of the following is a property of matter?

  • It does not interact with energy
  • It is composed of only one type of atom
  • It has mass and occupies space (correct)
  • It cannot undergo any physical or chemical changes
  • Which element is a noble gas at room temperature?

  • Chlorine
  • Sodium
  • Oxygen
  • Neon (correct)
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