The periodic table

• What are the horizontal rows in the modern periodic table called?

  Periods
• How are elements arranged in the modern periodic table?

  Elements are arranged in order of increasing atomic number
• What are the vertical columns in the modern periodic table called?

  Groups
• If elements are placed together in a group in the periodic table, what does this mean for their properties?


  Similar
• Why is the periodic table called ‘the periodic table’?


  The table is called a periodic table because similar properties occur at regular intervals.
• What do elements in the same group of the periodic table have in common regarding their outer shell electrons?

  They have the same number of electrons in their outer shell.
• How does the number of outer electrons affect the chemical properties of elements in the same group?

  It gives them similar chemical properties.