To find the number of neutrons in an atom, subtract the number of protons in the atom from the atom's mass. These numbers are found on the periodic table of elements. More »

Lead has 125 neutrons. It also has 82 electrons and 82 protons, and its atomic symbol is Pb. Lead is a metal that has been known since ancient times. More »

The most abundant isotope of magnesium has 12 neutrons; it is therefore, technically known as magnesium-24. Calculating the number of neutrons in an isotope of any element involves subtracting that element's atomic numbe... More »

To find the mass number of an element or isotope, add the neutrons and protons in one atom. Hydrogen is just one element with multiple isotopes occurring naturally, appearing in atomic form with just one proton (mass num... More »

The atomic number of an atom is the number of protons that resides in the nucleus, while the mass number is the number of protons and neutrons combined. The atomic number determines the type of element an atom, while the... More »

The size of an atom is dependent on the type of atom the number of protons, neutrons and electrons it contains. Each atom on the periodic table has a different size. More »

The Bohr model for silver explains the number of electrons, protons and neutrons that are present in the atom, and it diagrams the placement of the electrons within silver’s five energy levels. Silver’s Bohr model indica... More »