4.2 The arrangement in the periodic table of elements

• Explain the position of period and group in the periodic table


  period: horiztonal

  element: vertical
• explain the arrangement of the periodic table

  in increasing proton number/atomic number
• how to define a 'group'

  by the number of valence electrons
• if group 1-13 is metal then what is group 14-18?

  non-metal
• give the nickname for group 1

  Alkali metals
• give the nickname for group 17

  Halogen
• give the nickname for group 18

  Noble gas
• how to define a 'period'

  decided by number of shells occupied with electron
• Which is the proton number?

  Z

  
• Name the groups

  1, 2, 13, 14, 15, 16, 17, 18
• How to determine chemical properties

  by valence electrons
• Why do atoms react with each other?

  to achieve stability