In iron, there are 30 neutrons.
mass number = protons + nuetrons
mass number = protons + nuetrons
Z, also known as the mass number, describes the total number of protons and neutrons in a nucleus.
mass number
the no of electrons in a neutral atom is equal to the total no of proton so no of electron is equal to 30.
The Mass Number.
Number of Neutrons = Mass number - Atomic Number
Isotope.
there are 12 nuetrons in an atom of magnesium
add the number of protons and nuetrons together
The most common isotope is 20
An isotope.