Q. 385.0( 4 Votes )

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?

Answer :

Element A is K (Potassium).


The electronic configuration of element A (atomic number 19) would be 2, 8, 8, 1. As it has only one valence electron therefore it must be a metal. Thus it is potassium.


Element B is Cl (Chlorine).


The electronic configuration of element B (atomic number 17) would be 2, 8, 7. As it has 7 valence electrons therefore it must be a non-metal. Thus it is chlorine.


A metal and a non-metal usually combine with an ionic bond. Metals have tendency to lose electrons and form cations whereas non-metals can accept electrons to form anions.


Dot structure:



Potassium and chlorine will combine with an ionic bond to form potassium chloride (KCl).


The electron dot structure of KCl is as given below:



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