If oxygen have 8 protons and 5 electrons is it stable
In order to determine the stability of an atom, you need to compare the number of protons (which determines the element) to the number of electrons (which determines the overall charge).
In the case of oxygen, the atomic number is 8, which means it has 8 protons. However, you mentioned that it has 5 electrons.
Under normal conditions, the number of protons and electrons in an atom should be equal for it to be electrically neutral and stable. Oxygen atoms typically have 8 electrons to balance out the 8 protons.
If an oxygen atom actually had 5 electrons, it would carry a net negative charge because there would be more negatively charged electrons than positively charged protons. This would make it unstable, as atoms generally seek to be neutral.
So, based on the information provided, an oxygen atom with 8 protons and 5 electrons would not be stable.