Question

Which feature defines a neutral atom?
A. the ability to change substance during a chemical reaction
B. a full outer electron shell
C. the number of electrons to the number of protons
D. a low level of reactivity

Answer 1

The feature that defines a neutral atom is:

C. the number of electrons to the number of protons

In a neutral atom, the number of protons (positively charged) equals the number of electrons (negatively charged), resulting in no overall charge.