Among nacl and cscl which is easily formed and which is strong ionic
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Cscl. For ionic nature cation size should be large. As cs is larger than Na w.r.t size hence cscl is more ionic. When the size of cation increases polarisation decreases which is measure of covalent nature of bond.Thus Cs being larger in size makes CsCl more ionic.
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Answer:
According to Fazan's rule,
CsCl will be more ionic than NaCl.
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