Conceptual questions

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I have two questions.

1)Why do ionic hydrides have more density than the corresponding metals?

I know that interstitial hydrides have lower density than the corresponding metals from which they were formed as the crystal lattice expands due to inclusion of H2. What makes ionic hydrides more denser then?

2) Why is CsF highly soluble in water whereas CsI is least soluble (both in comparision to its group)

#Chemistry #Inorganic Chemistry

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4 Answers

Euclid ·2010-10-18 07:03:24

2) its smply Fajan rule...CsF is more ionic than CsI

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Euclid ·2010-10-18 07:06:41

1) ionic or saline hydrides are crystalline solids with high melting and boiling points...

also they are purely stoichiometric!!! interstitial halides are metallic halides...

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qwerty ·2010-10-18 10:04:05

CsI is more covalent bcz of polarizibility of I , while CsF is highly ionic ,
as we go donw the halogen grp , size of X^- increases , and hence the X^- molecule can be polarised by the cation mor easily as we go down d grp .
hence CsF is most soluble and CsI the least