Inorganic Chemistry #3: Periodicity of Period 3 Chlorides and Other Elements (Slides and Tasks)

LESSON OBJECTIVE: Understand the periodicity of the Period 3 chlorides and for other elements in the Periodic Table

In this lesson we investigate the periodicity observed in the Period 3 chlorides and extrapolate our understanding of periodicity to other elements beyond just Period 3 in the Periodic Table. This is lesson three in our inorganic chemistry series for Unit 9: The Periodic Table: chemical periodicity (from the Cambridge International AS Chemistry Curriculum (9701) 2019-2021 curriculum).

Learning Outcomes:
(taken from the Cambridge International AS and A Level Chemistry (9701) 2019-2021 curriculum)
9.2 Periodicity of chemical properties of the elements in Period 3
a) 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)

b) state and explain the variation in oxidation number of the oxides (sodium to sulfur only) and chlorides (sodium to phosphorus only) in terms of their outer shell (valence shell) electrons

e) describe and explain the reactions of the chlorides with water

f) interpret the variations and trends in 9.2(b), ©, (d) and (e) in terms of bonding and electronegativity

g) suggest the types of chemical bonding present in chlorides and oxides from observations of their chemical and physical properties

9.3 Chemical periodicity of other elements
a) predict the characteristic properties of an element in a given group by using knowledge of chemical periodicity

b) deduce the nature, possible position in the Periodic Table and identify of unknown elements from given information about physical and chemical properties