Electrons are known to be to the smallest subatomic particle

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Can someone me with 6 to 10 plz this is for masteries test.

Areader can tell that the meaning of “obnoxious” will include “having the quality of something” because of the .a) prefix b)pronunciation c)suffix d) word root