Periodic table 🩸

• Who made the first accurate periodic table and when?


  Dmitri Mendeleev. 1869.
• How did Mendeleev arrange the periodic table?

  Vertical columns - chemical properties

  horizontal rows - increasing relative atomic mass
• What did Mendeleev not leave space for in his periodic table?

  Noble gases, isotopes and any other undiscovered elements.
• What is the periodic table arranged like now?

  Groups - (8 groups) react similarly, have similar chemical properties and same number of electrons in outer shell.

  Periods - (7 rows) go up in atomic number.
• What does the left side of the periodic table contain?


  Metals.
• What does the right side of the periodic table contain?


  Non- metals.
• Which group has a full outer shell?

  Noble gases.
• What do electrons occupy?

  Electron shells.
• What is the structure of electron shells?

  2,8,8.
• What are transition metals?


  Transition metals are a group of elements in the periodic table that have partially filled d electron shells.
• How did Mendeleev predict the existence of properties of elements yet to be discovered?


  He used the patterns he saw when arranging so he left gaps for them.
• How does the position of an element link to its electronic configuration?

  If an element is in group 7 then that means the electrons on its outer shell is 7 electrons.