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Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?

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Electronic configuration of A(21) : 2    8     8      1  
Electronic Configuration of B(17):  2    8       7

A is an electropositive element so it tends to lose an electron to attain noble gas configuration on the other hand B is an electronegative element
which takes an electron and gains noble gas configuration.
Based on atomic number A is potassium and B is Chlorine.

Electron dot structure:

Ionic bond will be formed.

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