The proton number never changes in an element; it’s basically what makes that element that element. [4] X Research source

The proton number never changes in an element; it’s basically what makes that element that element. [4] X Research source

The atomic weight is an average of the isotopes of the element, so that’s why it’s not usually a whole number. [7] X Research source

N = M – n N = number of Neutrons M = atomic Mass n = atomic number

N = number of Neutrons M = atomic Mass n = atomic number

N = M – n N = number of Neutrons M = atomic Mass n = atomic number

N = number of Neutrons M = atomic Mass n = atomic number