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Chemistry Note

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Periodicity

Feature Title

In this chapter you should be able to:

  • Describe the arrangement of elements in the periodic table in order of increasing atomic number
  • Distinguish between the terms group and period
  • Deduce the relationship between the electron configuration of elements and their position in the periodic table
  • Describe and explain the periodic trends in atomic radii,ionic radii,ionization energies,electronegativity and melting points for the alkali metals (Li -> Cs) halogens (F -> I) and period 3 elements Na -> Ar)
  • Discuss the similarities in chemical nature of elements in the same group
  • Discuss the change in nature,from metallic to non-metallic, of the elements across period 3.
  • Explain the physical properties of the chlorides and oxides of the elements in the third period (Na -> Ar) in terms of their bonding and structure
  • Describe the chemical trends for the chlorides and oxides
  • Lis the characteristic properties of transition elements
  • Identify which elements are considered to be typical of the d-block elements
  • Describe the existence of variable oxidation states in d-block elements
  • Define the term 'ligand'
  • Describe how complexes of d-block elements are formed
  • Explain why some complexes of d-block elements are coloured
  • Outline the catalytic behaviour of d-block elements are coloured

 

 

 

Ionic Radius

 

Cations - negative ions
- fewer electrons than protons
- smaller,number of electron shells decreased
- small than parent atom

Anions - positive ions
              - fewer protons than electrons

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