they can find dna at the crime scene wich will lead them to the guilty party
Answer: The reaction of formation of ions by fluorine and potassium is
.
Explanation:
Atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1. So, in order to attain stability it needs to lose 1 electron due to which it forms
ion.
Atomic number of fluorine is 9 and its electronic distribution is 2, 7. In order to attain stability it needs to gain one electron and hence forms
ion.
Therefore, when both these ions come in contact with each other then it leads to the formation of KF compound.
The reaction equation for this is as follows.

Thus, we can conclude that the reaction of formation of ions by fluorine and potassium is
.
Copper + sulfur create copper sulfide.
It's a lengthy process to find the empirical formula:
Sulfur:

Copper:

S:Cu =>
=>
=> 
The empirical formula would just be 