Practice Quiz: Electron configuration; Exothermic reaction; Formula for binary compound etc.

I just need the answer!!!!!!!!!!!!!!!!!

Question 11    Multiple Choice  20 points    
   ls2 2s2 2p5 is the electron configuration for  
  nitrogen  
sulfur  
magnesium  
fluorine  

Question 12    Multiple Choice  20 points    
   An atom of the isotope sulfur - 31 consists of how many protons, neutrons, and electrons, (p = proton, e = electron, n = neutron):  
  15 p, 16 n, 15 e  
16 p, 15 n, 16 e  
16 p, 31 n, 16 e  
32 p, 31 n, 32 e  
16 p, 16 n, 15 e  

Question 13    Multiple Choice  20 points    
   An exothermic reaction causes the surroundings to:  
  warm up  
become acidic  
expand  
decrease its temperature  
release CO2  

Question 14    Multiple Choice  20 points    
   Which is the formula for the binary compound of potassium and nitrogen?  
  KN  
K2N  
NK2  
K3N  
NK3  

Question 15    Multiple Choice  20 points    
   How many mL is 0.005 L?  
  0.000005  
0.5  
5  
50