[redbox]

Which of the following compounds would you expect to show the greatest degree of covalent character? Explain.

BeF2, LiF, NaF. BeCl2, LiCl, NaCl, BeI2, LiI, NaI

[Dan]

http://www.chemicalforums.com/index.php?page=forumrules pay particular attention to rule 4.

[english]

How are the compounds related? What distinguishes an ionic compound from a covalent compound? 

Remember that even ionic compounds have covalent character, which the question states.

[redbox]

I don't know whether i should answer the question base on the polarizing power or the electronegativity.

Is that for a ionic compound, we should consider polarizing power?

And for the covalent compound, we should consider the electronegativity, am i correct?

[english]

All of the compounds you mentioned are ionic compounds.  You must determine which has the most covalent character.

Remember the difference between ionic bonds and covalent bonds?  Compare NaCl, MgCl₂, AlCl₃, and Cl₂.

What is happening to the compounds of chlorine as we move from Group 1(A) towards Group 7(A)? 

[vhpk]

Why does Lithium get the first place in the electro-chemical series?

[xiankai]

Why does Lithium get the first place in the electro-chemical series?

electro-chemical series = the difficulty of adding an electron

lithium's atom is very small, what implications will this have on the difficulty of adding an electron?

PS: no idea how this is related to the original question, u'll be better off starting a new topic :O

[vhpk]

Compare the melting temperature of MgCl₂ and NaCl