Answer: The ion formed by lithium element is 

Step-by-step explanation:
Ions are formed when an atom looses or gains electrons. 
If an atom gains electrons, it leads to the formation of negative ions known as anions. For Example: Fluorine gains 1 electron to form 
 ions.
 ions. 
If an atom looses electrons, it leads to the formation of positive ions known as cations. For Example: Sodium looses 1 electron to form 
 ions.
 ions.
Lithium is the 3rd element of the periodic table having 3 electrons.
The electronic configuration of lithium element = 

This element will loose 1 electron to attain stable electronic configuration and will lead to the formation of 
 ion.
 ion.
Hence, the ion formed by lithium element is 
