Answer:
describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule
 
        
                    
             
        
        
        
Answer:
they are the same element because they have the same number of protons and electrons,but a different number of neutrons
 
        
             
        
        
        
Based on (repeated) experiments or observations, that describe or predict a range of natural phenomena. the answer is c (sorry if i’m incorrect)