The atomic mass of elements is measured with the help of unified atomic mass units. One unified atomic mass unit can be quantified as the weight of one-twelfth of the mass of a carbon-12 atom considering that it is at rest. Since protons and neutrons account for almost all of the mass of the given atom, the atomic mass of a given element is almost equal to its mass number.
What is the Atomic Mass of Elements?
The atomic mass of an element can be described as
the total mass of one atom of the given element. Its unit is called the unified atomic mass unit and is denoted by the symbol ‘u’.
Standard atomic weight is used to give the value of the mean of the atomic masses in a mixture of isotopes in a given sample of an element.
|Learn more ⇒ Interactive Periodic Table
Atomic Mass of First 30 Elements
Given below is a table that lists the first 30 elements based on atomic number and their corresponding atomic mass.
The Molecular mass of an element can be calculated by adding the atomic masses of each of its constituents. There are many ways to find the atomic mass of an element, but the easiest way is to look it up on the periodic table of elements.
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Periodic Table of Elements
Atoms and Molecules
Size of an Atom or Ion
Atoms, Molecules and Ions
One Mole of a substance is defined as the total number of atoms in 12 grams of Carbon-12 isotope. It is denoted by ‘mol’ and is also referred to as gram molecular weight.
Frequently Asked Questions – FAQs
What is atomic mass?
Atomic mass is the average mass of the protons, neutrons, and electrons in an atom. Its unit is a unified atomic mass and is denoted by the symbol ‘u’.
What is one amu?
An Atomic mass unit or one amu is the mass unit equivalent to the one-twelfth mass of one atom of the carbon-12 isotope.
Why was carbon-12 selected as the reference element for calculating atomic mass?
Carbon-12 was chosen as a reference element for calculating atomic mass because it is naturally occurring and is present in abundance.
Is the one amu SI unit of atomic mass?
An Atomic mass unit or one amu is the physical constant accepted in the SI measurement system.
What is the full form of amu?
The atomic mass unit is the full form of amu. It is equivalent to the one-twelfth mass of one atom of the carbon-12 isotope.