21. We had set free for the first time the immense cosmic forces hidden within the atomic nucleus . 22. In the case of an excited atomic nucleus , the arbitrarily small disturbance comes from quantum vacuum fluctuations. 23. :The strong force holds neutrons together with protons in the atomic nucleus and also holds quarks together. 24. A typical atomic nucleus closely approximates cylindrical symmetry and therefore all off-diagonal elements are close to zero. 25. But you probably mean splitting an atomic nucleus ; talk ) 13 : 02, 30 November 2007 ( UTC) 26. This occurs when a high-energy proton strikes an atomic nucleus , causing large numbers of nucleons to be ejected. 27. The liquid drop model of the atomic nucleus predicts equal-sized fission products as an outcome of nuclear deformation. 28. It may also be an atomic nucleus devoid of electrons, such as an alpha particle, a helium nucleus. 29. It consists of a dense core called the atomic nucleus surrounded by a space called the electron cloud. 30. The electrons of an atom are attracted to the protons in an atomic nucleus by this electromagnetic force.