<u>Answer:</u> The outermost valence electron enters the p orbital.
<u>Explanation:</u>
Valence electrons are defined as the electrons which are present in outer most orbital of an atom.
Sulfur is the 16th element of the periodic table having 16 electrons.
Electronic configuration of sulfur atom is 
The number of valence electrons are 2 + 4 = 6
These 6 electrons enter s-orbital and p-orbital but the outermost valence electron will enter the p-orbital.
Hence, the outermost valence electron enters p orbital.
 
        
             
        
        
        
I think the correct answers from the choices listed above are the first, third and the last option. Ionic compounds are compounds that dissociates into ions when in aqueous solution. From the list, NH4Cl, KF and MgO are the ionic compounds. Hope this answers the question.
        
                    
             
        
        
        
Answer:
270.34
Explanation:
pressure, 550                pressure, 270.34
______________   =   ___________
177 degree celsius.        87 degree celsius.
550 x 87 / 177 = 270.34
 
        
             
        
        
        
i think that the answer is d. millions of small rocky objects