Group 0 elements

• What are the Group 0 elements commonly known as?

  Noble gases
• Why are noble gases considered dull?


  They don’t react with very much and are not visible.
• Which elements are included in the Group 0 elements?


  Helium, neon, and argon
• How many electrons do noble gases have in their outer energy level?


  Eight electrons, except for helium which has two.
• Why do noble gases not need to gain or lose electrons?


  Because their outer shell is energetically stable.
• What does it mean for noble gases to be inert?


  They do not react with much at all.
• What state do noble gases exist in at room temperature?


  Monatomic gases
• Why are noble gases colorless at room temperature?


  Because they are inert and do not react.
• What happens to the boiling points of noble gases as you move down the group?


  The boiling points increase along with increasing relative atomic mass.
• What causes the increase in boiling point among noble gases?


  An increase in the number of electrons leading to greater intermolecular forces.
• If neon is a gas at 25 °C, what state is helium at this temperature?


  Helium is also a gas at 25 °C.
• Given the boiling points of radon and krypton, how would you estimate the boiling point of xenon?


  Xenon's boiling point would be approximately −108 °C.
• What are the key characteristics of noble gases?


  • Inert and do not react
  • Colorless gases at room temperature
  • Exist as monatomic gases
  • Stable electron configuration
• What is the boiling point of radon?


  −62 °C
• What is the boiling point of krypton?


  −153 °C
• How does the reactivity of noble gases compare to other groups of elements?


  Noble gases are much less reactive than other groups of elements.
• What is the significance of noble gases being monatomic?


  It means they exist as single atoms not bonded to each other.
• What is the relationship between noble gases and fire?


  Noble gases will not set on fire due to their inert nature.
• What are Group 0 elements commonly known as?

  Noble gases
• Why are Group 0 elements unreactive?


  Their electronic structure is stable
• Which of the following is NOT a Group 0 element?


  H
• What trend occurs in the boiling points of Group 0 elements as you go down the group?


  Boiling points increase
• What happens to the attractive forces between atoms in Group 0 elements as you go down the group?


  They become stronger
• What is the physical state of Group 0 elements at room temperature?


  They are colorless monatomic gases
• What changes occur in Group 0 elements as you go down the group?


  1. Atoms become larger
  2. Intermolecular forces between atoms become stronger
  3. More energy is needed to overcome these forces
• What are Group 7 elements commonly known as?


  Halogens
• What is the structure of Group 7 elements?


  They are simple molecules made up of pairs of halogen atoms
• What type of bond joins the halogen atoms in Group 7 molecules?


  A single covalent bond
• Which of the following is NOT a Group 7 element?


  He
• What trend occurs in the reactivity of Group 7 elements as you go down the group?


  Reactivity decreases
• What happens to the melting and boiling points of Group 7 elements as you go down the group?


  Melting and boiling points increase
• What happens to the relative molecular mass of Group 7 elements as you go down the group?


  It increases
• What is an example of a reaction involving a Group 7 element and a non-metal?


  Hydrogen + Chlorine → Hydrogen Chloride
• Write the balanced equation for the reaction of hydrogen and chlorine.

  H2(g) + Cl2(g) → 2HCl(g)