![]() It's thought that another one of these magic numbers lies just beyond the range of currently known elements, which means we could potentially discover some new elements that are relatively stable and extremely massive. There are believed to be certain numbers/ratios that are inherently more stable. Hence, larger atoms become more unstable. Sodium atoms have 11 protons and so 11 electrons: two electrons occupy the first shell. The ratio of neutrons to protons gradually increases to try to compensate, but this results in the neutrons getting more unstable themselves, resulting in more opportunity for weak forces to destabilize them. With all of that to consider, as you get larger and larger nuclei with more protons, the electromagnetic forces increase, as well as the distances in the nuclei, putting more strain on the nuclear forces holding it all together. Neutrons will help add to this nuclear force, but they tend to become unstable when they get into too great of concentration and the weak force will cause them to decay into protons. An early model of the atom was developed in 1913 by Danish scientist Niels Bohr (18851962). Each element, when electrically neutral, has a number of electrons equal to its atomic number. ![]() Fusion allows these protons to get close enough together for the stronger, yet short ranged, nuclear force to overpower the electromagnetic force. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. The electromagnetic force of the protons wants to push them away from each other. See the top left number of the box, that 11 That is sodium's atomic number or proton number. 11 Explanation: On the periodic table, find sodium. There are several forces at work inside the nuclei of atoms. is 11 so it has 11 protons Answer link Nam D.
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