Question

In sodium chloride it is written answers that NaCl but I'm calcium chloride it is written that CaCl2

My question is why in calcium chloride we are writing chloride as Cl2 but not sodium chloride.

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Answer 1

Because in CaCl2 calcium has valency of +2 ond chlorine has a valency of - 1 so by criss-cross method we have formula CaCl2

.but in case of sodium chloride, Sodium (Na) has a valency of +1 and chloride - 1 so by criss-cross method, we get formula NaCl.

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Answer 2

Since,valency of Na(Sodium) is 1+ and Chloride is 1-.So when reacting they both cancel.

Whereas,Valency of calcium is 2+ and chloride is 1-.So when reacting Ca loses 2 electrons and chloride gains 2 electrons.

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