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 »

Neutrons are always found within the atom's nucleus. They are one of the three main building blocks on an atom, along with protons and electrons. Each type of element has a specific number of each of these building block... More » Science Biology Cells

The protons, neutrons and electrons present in an ion are determined from a periodic table. The atomic number represents the protons in an element. The atomic mass minus the atomic number represents the neutrons. In a ne... More » Science Chemistry Atoms & Molecules

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 »

To draw a Bohr model of an atom, first find the number of protons, neutrons and electrons in the atom from its atomic weight and atomic number. After that, place the neutrons and the protons in the nucleus, and draw the ... More »