Using condensed electron configurations and Lewis electron-dot symbols to depict

Question

Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of their compound.

(a) Be and S     

(b) O and Ca

(c) Mg and Br    

(d) O and Ga

For each pair, choose the compound with the higher lattice energy.

(a)    CaO or CaS  

Explain your choice.

O has a smaller radius than S.

S has a smaller radius than O.    

O is more electronegative.

S is more electronegative.

(b)    KBr or KI

Explain your choice.

Br has a smaller radius than I.

I has a smaller radius than Br.    

Br is more electronegative.

I is more electronegative.

Explanation / Answer

1) BeS CaO ,MgBr 2 ,GaO. 2)CaO will have higher lattice energy as the distance between the ions decrease lattice enthapy increases due to increase in coloumbic interaction , as O has smaller size so it will have higher lattice energy 3 )kbr. Will have higher lattice energy as the size of Br is less than iodine (I)

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