An atom of element Be has four protons, four electrons, and five neutrons. Which element below could be an isotope of this atom?

Beryllium-10

Be is the element beryllium, and isotopes don’t change the element it does not change the protons only the electrons and neutrons. Sense the amount of protons determines the element and the amount of protons isn’t changing then the element isn’t changing either

The answer to the question is d

A. is your answer.  hope this