The most common isotope is 20
mass number
there are 12 nuetrons in an atom of magnesium
Finding the number of electrons in an atom is easy. You just have to know the atomic number of the element. The atomic number for Potassium is 19. That means Potassium has 19 electrons.
An isotope.
The sum of the number of the protons and neutrons in the nucleus of an atom is called as atomic mass.
20
mass number
mass number = protons + nuetrons
The Mass Number.
Number of Neutrons = Mass number - Atomic Number
Isotope.
there are 12 nuetrons in an atom of magnesium
mass number = protons + nuetrons
In iron, there are 30 neutrons.
add the number of protons and nuetrons together
Only elements have a particular (unique) atomic number. Potassium (K) has 19 and chlorine (Cl) has 17 as atomic number (= proton number)
Finding the number of electrons in an atom is easy. You just have to know the atomic number of the element. The atomic number for Potassium is 19. That means Potassium has 19 electrons.