# Atomic Mass Of All Elements

Chemical elements listed by atomic mass The elements of the periodic table sorted by atomic mass. Click on any element's name for further information on chemical properties, environmental data or health effects. This list contains the 118 elements of chemistry. Amu (atomic mass unit): the standard unit of measurement of atomic mass. The mass of one carbon-12 atom is set at 12 amu; the atomic mass of atoms of all other elements is determined relative to the mass of carbon-12. Avogadro’s number: the number of units in one mole: 6.022 × 1023, which is the number of atoms in 12 grams of carbon-12.

Mass Numbers - How to find Mass Numbers
The mass number is established by rounding the atomic weight to the nearest whole number. The Periodic Table with Atomic Masswill give you the atomic weight, or atomic mass, of the elements. The chemical properties of an element are determined by its Atomic Number not its Mass Number which is why atomic numbers are shown on the Periodic table whilst Mass Numbers are not. Mass numbers equal the total number of heavy, or massive, particles in the nucleus. Subtracting the Atomic number from the Mass Number equals the number of neutrons in the nucleus.

## Periodic Table With Mass Numbers

Mass Numbers = Atomic Weight of Element, rounded to nearest whole number

Number of Neutrons = Mass Number - Atomic Number

## Mass Numbers

Mass Numbers - The Mass Numbers of all of the elements
So, if we know the number of protons and neutrons in an atom we can determine the mass number. The unique chart below has been created by www.elementalmatter.info and details all of the elements in the Periodic table, the numbers of protons, the numbers of neutrons and the mass numbers of atoms which relate to the elements.

Mass numbers - Examples of Mass Numbers
The following examples provide details of how to calculate the mass number.

• Example 1 - mass number of Gold: The element Gold (Symbol Au) has the Atomic Number of 79. The number of protons in atom of gold is therefore 79. Gold has the Atomic Mass weight of 196.97. Round to the nearest whole number. The mass number of gold is therefore 197.
• Example 2 - mass number of Silver: The element Silver (Symbol Ag) has the Atomic Number of 47. The number of protons in atom of silver is therefore 47. Silver has the Atomic Mass weight of 107.87. Round to the nearest whole number. The mass number of silver is therefore 108.
• Example 3 - mass number of Neon: The element Neon (Symbol Ne) has the Atomic Number of 10. The number of protons in atom of neon is therefore 10. Neon has the Atomic Mass weight of 20.18. Round to the nearest whole number. The mass number of neon is therefore 20.

Mass Numbers = Atomic Weight of Element, rounded to nearest whole number

## Average Atomic Mass Of All Elements

Mass numbers - Chart of Mass Numbers
The details all of the elements in the Periodic table, the numbers of protons, the numbers of neutrons and the mass numbers of atoms which relate to the elements in the Periodic Table.