Negetive charge on more EN atom is more stable and Positive charge on less EN atom is more stable

Note: *Negative charge on more EN-Atom is more stable.

Example:-

=> HO^-   is more stable than    H₂C^-

-> 8 protons                          -> 6 protons

-> more attraction          

    So, more stable

Note: *Positive charge on less EN-Atom is more stable.

Example:-

=> H₃C⁺    is more stable than     HO⁺

-> 6 protons                              -> 8 protons

                                                 -> more repulsion

                                                      So, less stable