Exotoxin is a toxin secreted by bacteria. exotoxin can cause damage to the host by destroying cells or disrupting normal cellular metabolism
        
             
        
        
        
Answer:
SiF4 is not a polar covalent bond.
Explanation:
SiF4 is a nonpolar molecule because the fluorine's are arranged around the central silicon atom in a tetrahedral molecule with all of the regions of negative charge cancelling each other out.
 
        
             
        
        
        
Answer:
Explanation:
A)  O2 (non polar covalent)
B)  HF  (polar covalent)
C) NaCl (because its ionic)
im not 100% sure hope it helps
 
        
             
        
        
        
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