Group 0

• What is the electronic structure of helium?

  Helium has two electrons in the first energy level.
• Why are noble gases unreactive?

  They have a full outer energy level, making them stable.
• What is the first noble gas mentioned in the material?

  Helium
• How many electrons does neon have in its outer energy level?

  Neon has eight electrons in its outer energy level.
• What is the maximum number of electrons the second energy level can hold?

  The second energy level can hold a maximum of eight electrons.
• Why is argon considered unreactive?

  Argon has a full outer energy level with eight electrons.
• What is the key fact about the group zero noble gases?

  • All noble gases have a full outer energy level.
  • This full outer energy level makes them unreactive.
• What is the boiling point of noble gases compared to room temperature?

  All noble gases have boiling points lower than room temperature.
• How do the boiling points of noble gases vary down the group?

  The boiling points increase as the relative atomic mass increases down the group.
• What is the relative atomic mass of helium?

  The relative atomic mass of helium is four.
• What is the relative atomic mass of radon?

  The relative atomic mass of radon is 222.
• Why are noble gases all gases at room temperature?

  Because they all have boiling points lower than room temperature.
• Who produced the original periodic table that did not feature group zero?

  Dimitri Mendeleev
• When were the noble gases fully discovered?

  After Mendeleev developed his periodic table.
• What are the key characteristics of group zero noble gases?

  • Very unreactive elements
  • Full outer energy levels
  • Boiling points lower than room temperature
  • Boiling points increase down the group