Chemistry
Assertion (A) : Synthetic detergents can lather wen in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A is false but R is true
Both A and R is true and R is the correct explanation of A
A is true but R is false
Both A and R is true but R is not a correct explanation of A

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Chemistry
Atoms of different elements have

Different atomic number and same eletronic configu-ration
Different atomic number and different number of valence electrons
Same number of electrons and neutrons
Same atomic number and same electronic configuration

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