group 1 and group 7

• What are the physical properties of alkali metals?

  They are soft, have low density, and low melting points.
• How do alkali metals react with water?

  They are highly reactive with water, producing hydroxides and hydrogen.
• What happens to the reactivity of alkali metals as you go down the group?

  The reactivity increases as you go down the group.
• What trend is observed in the melting and boiling points of alkali metals?

  Melting and boiling points decrease as you go down the group.
• Why is group 1 considered reactive?

  They have 1 electron in their outer shell, which they can easily lose to become stable.
• How does the distance of the outer shell from the nucleus affect reactivity in alkali metals?

  Increased distance weakens the attractive force, making it easier to lose the outer electron.
• What is the general reaction of an alkali metal with water?

  Alkali metal + water -> alkali metal hydroxide + hydrogen.
• How does the energy released in reactions change as you go down the alkali metal group?

  The reactions release more energy as you go down the group.
• What is the general reaction of an alkali metal with oxygen?

  Alkali metal + oxygen -> metal oxide.
• What is a characteristic feature of alkali metals regarding their density?

  Alkali metals have low density.
• What is a characteristic feature of alkali metals regarding their melting points?

  Alkali metals have low melting points.
• How do alkali metals react with group 7 elements?

  They are highly reactive with group 7 elements.
• What type of bond is formed when diatomic molecules share electrons?

  Covalent bond
• How do the melting and boiling points of group 7 change as you go down the group?

  The melting and boiling points increase
• What happens to the reactivity of group 7 as you go down the group?

  The reactivity decreases
• Why does the reactivity of group 7 decrease as you go down the group?

  The outer shell gets further away from the nucleus, weakening the attractive force
• What is the consequence if there is not enough attraction for the nucleus to bring in another electron?

  The atom cannot react
• With which group do group 7 normally form bonds?

  Group 1
• What is a displacement reaction in the context of diatomic molecules?

  A more reactive metal displaces a less reactive one
• What determines if a metal can displace another in a displacement reaction?

  If it is higher in the group, it is more reactive
• What are the characteristics of noble gases?

  • Exist as colorless gases
  • Have full outer shells
  • Exist as singular atoms