1.5 Flashcards
what type of structure and bonding is present in CsCl
giant ionic
what is the coordination in CsCl
8:8
what is the name of the total structure of CsCl
body-centred cubic
what type of structure and bonding is present in NaCl
giant ionic
name the coordination in NaCl
6:6
what is the name of the total structure of NaCl
face-centred cubic
what is the structure of CsCl different to NaCl
caesium ions are bigger that chloride ions.
more Cl- ions can coordinate around Cs-1 due to difference in size
properties of giant ionic structures
high melting point
electrical conductivity when molten or dissolved
hard
brittle
why are giant ionic structures only conductive when molten or dissolved
when solid, ions are fixed in place and unable to move. when molten or dissolved, ions are free to move and carry an electrical current
why do giant ionic structures have a hign melting point
due to string electrostatic attraction between oppositely charged ions.
requires a lot of heat energy to overcome an ionic bond
