Chemistry C2

• Who was able to predict the properties of undiscovered elements?

  Mendeleev
• How has the Periodic Table changed over time?

  It has been organized differently by scientists
• How are elements ordered in Mendeleev's Periodic Table?

  By atomic mass
• What was a notable feature of Mendeleev's Periodic Table?

  It had gaps for undiscovered elements
• How are elements ordered in the modern Periodic Table?

  By atomic number
• What is the grouping method in the modern Periodic Table?

  Grouped by the number of electrons in outer shells
• Are there gaps in the modern Periodic Table?

  No gaps
• What is the distinction between metals and non-metals in the modern Periodic Table?

  Metals are to the left, non-metals to the right
• What problem did Mendeleev's Periodic Table have regarding element grouping?

  Some elements were grouped inappropriately
• What are the properties of noble gases in Group 0?

  Full outer shells, very unreactive, boiling points increase down
• What do alkali metals react with?

  Oxygen, chlorine, and water
• What do alkali metals form when they react with water?

  An alkali solution of their metal hydroxide
• What is the characteristic of Group 1 elements regarding their outer shell?

  One electron in their outer shell
• Why does reactivity increase down Group 1?

  Atoms increase in size and shielding increases
• What happens to the melting and boiling points of Group 1 elements as you move down the group?

  They decrease down Group 1
• What are Group 7 elements called?

  Halogens
• What is the state of fluorine at room temperature?

  Gas
• How does reactivity change down Group 7?

  Reactivity decreases down the group
• Why does reactivity decrease down Group 7?

  Atoms increase in size and shielding increases
• What is displacement in the context of Group 7 elements?

  More reactive elements replace less reactive ones
• What are the key terms related to the Periodic Table?

  • Alkali metals
  • Chemical properties
  • Displacement
  • Groups
  • Halogens
  • Inert
  • Isotopes
  • Noble gas
  • Organised
  • Periodic Table
  • Reactivity
  • Undiscovered
  • Unreactive
• What is the formula for lithium oxide when lithium reacts with oxygen?

  Lithium oxide
• What is the formula for lithium chloride when lithium reacts with chlorine?

  Lithium chloride
• What is the formula for lithium hydroxide when lithium reacts with water?

  Lithium hydroxide + hydrogen
• What is the state of bromine at room temperature?

  Liquid
• What is the state of iodine at room temperature?

  Solid
• What is the state of chlorine at room temperature?

  Gas
• What is the formula for potassium fluoride when fluorine displaces chlorine?

  Potassium fluoride
• What is the formula for potassium chloride before displacement occurs?


  Potassium chloride
• What is the formula for potassium chloride after fluorine displaces it?

  Chlorine
• What is the atomic symbol for lithium?

  Li
• What is the atomic symbol for sodium?

  Na
• What is the atomic symbol for potassium?

  K
• What is the atomic symbol for chlorine?

  Cl
• What is the atomic symbol for bromine?

  Br
• What is the atomic symbol for iodine?

  I
• What is the atomic symbol for helium?

  He
• What is the atomic symbol for neon?

  Ne
• What is the atomic symbol for argon?

  Ar
• What is the atomic symbol for xenon?

  Xe