1. b
2.a
3.c
I think . hope I get it right
        
             
        
        
        
According to sources, the most probable answer to this query is the reaction is spontaneous and will proceed without any energy input. This means that energy was produced and can result to a reaction.We appreciate your questions. Please, never hesitate to ask more in Brainly your queries. 
        
                    
             
        
        
        
Answer:
4. 60 neutrons.
Explanation:
The given isotopes;
          ¹⁰⁶₄₆Pd
In this isotope, we can deduce that the mass number is the superscript and the atomic number is the subscript; 
      Mass number  = 106 
      Atomic number  = 46 
Mass number is the number of protons and neutrons in an atom;
        Mass number = Protons + neutrons 
 Atomic number is the number of protons 
    
So,  Number of protons  = 46 
Number of neutrons  = Mass number  - Atomic number 
                                     = 106  - 46 
                                      = 60
Number of neutrons  = 60