Question

Of protons neutrons and electrons, which of these can never change in atom during an ordinary chemical or physical change

Answer 1

The number of electron or proton of an atom can change depending on the chemical bond and the other chemical it is bonded with; an atom can either gain or lose electron. However, the number of neutrons of an atom can never change, this is the primary identity or signature of an atom.

 

Answer:

neutrons