11 Asa Chemistry Periodicity Lessonplan

Instructional Objectives

(a) describe qualitatively (and indicate the periodicity in) the variations in atomic radius, ionic radius, melting point and electrical conductivity of the elements
(b) explain qualitatively the variation in atomic radius and ionic radius
(c) interpret the variation in melting point and in electrical conductivity in terms of the presence of simple molecular, giant molecular or metallic bonding in the elements
(d) explain the variation in first ionisation energy
(e) describe the reactions, if any, of the elements with oxygen (to give Na2O, MgO, Al2O3, P4O10, SO2, SO3), chlorine (to give NaCl,MgCl2, Al2Cl6, SiCl4,PCl5) and water (Na and Mg only)
(f) state and explain the variation in oxidation number of the oxides and chlorides in terms of their valance shell electrons
(g) describe the reactions of the oxides with water
(h) describe and explain the acid/base behaviour of oxides and hydroxides including, where relevant, amphoteric behaviour in reaction with sodium hydroxide (only) and acids
(i) describe and explain the reactions of the chlorides with water
(j) interpret the variations and trends in (f), (g), (h), and (i) in terms of bonding and electronegativity
(k) suggest the types of chemical bonding present in chlorides and oxides from observations of their chemical and physical properties
In addition, candidates should be able to:
(l) predict the characteristic properties of an element in a given group by using knowledge of chemical periodicity
(m) deduce the nature, possible position in the Periodic Table, and identity of unknown elements from given information about physical and chemical properties

Teaching process

  • Involves interpreatation of graphs for atomic radius, Ionic radius and Ionization energy
  • Various reaction of Period 3 elements
  • Performing chemical reactions at revelant topics

Suggested Readting

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License