Achemical bond between atoms results from the attraction between the valence electrons and of different atoms.

nuclei

Explanation:

A chemical bond between atoms results from the attraction between the valence electrons and nuclei of different atoms.  

When atoms approach one another, their nuclei and electrons interact and tend to distribute themselves in space in such a way that the total energy is lower than it would be in any alternative arrangement. If the total energy of a group of atoms is lower than the sum of the energies of the component atoms, they then bond together. Negatively charged electrons that are orbiting the nucleus and the positively charged protons in the nucleus attract each other. An electron positioned between two nuclei will be attracted to both of them, and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond.

uranium fissions/breaks up giving out energy and neutrons

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