Chemistry › Isotope
Mendeleev · Isotope
Hydrogen-3 (tritium)
Hydrogen-3 (tritium): atomic number 1, mass number 3, with 1 protons and 2 neutrons.
IsotopeH
31H
Protons1
Neutrons2
Electrons (neutral)1
The proton count fixes the element: 1 protons identify Hydrogen. Mass number 3 is the total number of protons and neutrons.
A neutral Hydrogen-3 (tritium) atom also has 1 electrons. Changing neutrons changes the isotope; changing electrons changes the charge.