There's growing evidence ...Fentanyl (or hydromorphone) have a better side effect profile than morphine (remember the vaunted vasodilation is only a side effect) thereby making fentanyl a better choice..
The subatomic particles in the nucleus of a carbon atom are protons and neutrons. The atomic nucleus contains protons and usually neutrons (except for hydrogen-1 (protium) atoms. The number of protons is an element's atomic number and is the same for all atoms of an element. Carbon has atomic number #6#. So all atoms of carbon have #6# protons in their atomic nuclei.
Smallest part of an element that can still retain the properties of that element. These make up the atom, and they are protons, neutrons, and electrons. This subatomic particle is in the nucleus of the atom, and has a positive charge. This subatomic particle circles the nucleus of an atom in a motion called an orbital.