$1.$Explain the anomalous behavior of Li and Be among Group $2$ elements.

$2.$ Predict the oxidation state of the central atom in the following oxyanions: IO$3-,$ XeO$4-,$ TeO$6-.$ Justify your answers using periodic trends.

$3.$Arrange the following elements in order of increasing electronegativity: O$,$ Cl$,$ S$,$ Si$.$ Explain your reasoning.

$4.$Explain the differences in the physical and chemical properties of Na and K based on their atomic structure. $5.$Draw the Lewis structure of XeOF$4$ and predict its VSEPR shape and hybridization.

$6.$Explain the stability of the dative bond in the complex ion $[$Fe$($CN$)6]3-.$

m$7.$Compare and contrast the bonding in CO$2$ and SiO$2.$ How do their structures differ?

e$8.$Predict the geometry and magnetic properties of the following complex ions: $[$Co$($NH$3)6]3+,[$Cr$($H$2$O$)6]3+.$

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