Question

Which feature defines an atom?

A. the numbers of electrons equal to. the number of protons
B. the ability to change to another substance during a chemical reaction
C. low level reactivity
D. a full outer electron shell

Answer 1

The ability to change another substance during a chemical reaction.

Step-by-step explanation:

It is because atom a

has the ability to change different substance into another kind of substance.(in my opinion)