IB DP Chemistry: SL复习笔记3.1.6 Periodic Trends: Chemical

Metallic & Non-metallic

  • Periodic trends can also be seen in the typical properties of metals and non-metals which are summarised below:

3.1.6-Properties-of-metals-and-non-metals

The typical properties of metals and non-metals

  • The typically properties of metals and non-metals can be explained by reference to their trends in atomic radius, ionic radius, ionisation energy, electron affinity and electronegativity
  • The low ionisation energies and low electronegativities of metals can account for the ability of their valence electrons to move away from the nucleus
    • This is known as 'delocalisation' of the electrons
  • These properties increase from left to right as you transition from metal to metalloid to non-metal
  • The high electronegativity and electron affinity of non-metals can be related to their tendency to share electrons and form covalent bonds, either with themselves or other non-metal elements
  • The similarities in electronegativities of the diagonal band of metalloids which divides the metals from the non-metals explains the behaviour of metalloids

Test yourself on the trends in the periodic table:

Worked Example

Which increase across a period from left to right?3.1.6-Worked-Example_-Periodic-properties

 

Answer:

The correct option is D

    • Across a period atomic radius decreases, electronegativity and ionisation energy increase and ionic radius increases then decreases

 

 

 

 

转载自savemyexams

更多IB课程
翰林国际教育资讯二维码