Oxygen is the most common element which Sulfur makes covakent bonds with as in SO3 or H2SO4
        
                    
             
        
        
        
Answer:
okay but give me brainliest
Explanation:
A volcano is formed when hot molten rock, ash and gases escape from an opening in the Earth's surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here. As a volcano erupts, it spills lava that flows downslope. Volcanic flows are called lahars.
 
        
             
        
        
        
A is the answer! I’m pretty sure hopefully i helped!!
        
             
        
        
        
It is in period 3
It is in group 17 
It is a chlorine atom because it has 17 electrons which means the atomic number is 17