Let me see, So you want to know what makes atoms stable or unstable?
Atoms are so confusing and how in the world am I supposed to know this??
All around us are atoms which are made up of..? What particles are in the nucleus?
I know this one! Protons, neutrons, and electrons! Protons and neutrons are in the nucleus right?
Oh so if an atom is added a proton in the nucleus it is subject to be unstable! That also means the the atomic mass is the number of protons and neutrons because they are the only particles that weigh something! Thank you!!!
Yes. The atomic mass is the number of protons and neutrons but if the atom has an unbalanced number of protons and neutrons, the atom is considered unstable.