Question

Which of the following is a product formed when K reacts with Cl2?

Answer 1

Answer: KCl

Explanation: Potassium [K]  has an atomic no of 19 and the electronic configuration is:

$K :1s^22s^22p^63s^23p^64s^1$ tends to get stable by losing one electron and forming $K^+$

Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :

$Cl :1s^22s^22p^63s^23p^5$ tends to get stable by gaining one electron and forming $Cl^-$

$K^+$ and $Cl^-$ attract each other and form an ionic bond. As we have a chlorine molecule that is two atoms of chlorine are present, 2 atoms of potassium will react to form 2 moles of KCl.

$2K+Cl_2\rightarrow 2KCl$

Answer 2

The answer is A. 
Which is... KCI