Chemistry › Isotope
Mendeleev · Isotope
Uranium-235
Uranium-235: atomic number 92, mass number 235, with 92 protons and 143 neutrons.
IsotopeU
23592U
Protons92
Neutrons143
Electrons (neutral)92
The proton count fixes the element: 92 protons identify Uranium. Mass number 235 is the total number of protons and neutrons.
A neutral Uranium-235 atom also has 92 electrons. Changing neutrons changes the isotope; changing electrons changes the charge.