Chemistry › Isotope
Mendeleev · Isotope
Hydrogen-1
Hydrogen-1: atomic number 1, mass number 1, with 1 protons and 0 neutrons.
IsotopeH
11H
Protons1
Neutrons0
Electrons (neutral)1
The proton count fixes the element: 1 protons identify Hydrogen. Mass number 1 is the total number of protons and neutrons.
A neutral Hydrogen-1 atom also has 1 electrons. Changing neutrons changes the isotope; changing electrons changes the charge.