Atomic Mass of Elements - Overview, Examples, Comparison, FAQs

The atomic mass of an element can be measured by the unification of atomic mass units. Considering that a carbon-12 atom is at rest, one unified unit of atomic mass equates to one-twelfth of its mass. The atomic mass of a given element is almost equal to its mass number since protons and neutrons are responsible for the majority of its mass.

The atomic mass of an element can be used in chemistry if the atomic mass of an element is combined with the idea of a mole: one mole of an element has a mass in grams equal to its atomic mass of elements in amu. One mole of iron atoms weighs 55.847 grams due to its atomic mass of elements of 55.847 amu. Ionic compounds and molecules can be treated in the same way.

Why do elements have different atomic masses?

Elements are described by their atomic mass. An atom's mass is the combined mass of all its protons. The unit is known as the unified atomic mass unit and is represented by 'u'.

As a measure of the average atomic mass of a mixture of isotopes in a given sample of an element, standard atomic atomic weight is used. Each element has different set of protons and neutrons in its nucleus, hence different atomic masses are observed. Below is the modern periodic table of elements depicting atomic number and atomic mass of the elements.

Apart from atomic mass, trends for various other physical quantities such as ionisation enthalpy, electronegativity etc. can be analysed from the modern periodic table.

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The atomic mass of first 20 elements to 30 elements

The following table contains a list of the atomic mass of first 30 elements ordered by atomic number and atomic mass.

The above table shows the atomic mass of all elements or atomic number of elements from 1 to 30. Such details can help in knowing the various physical quantities of elements.

To calculate a molecule's molecular mass, add the mass of each of its constituent atoms. There are several methods of finding the atomic mass of an element, but the simplest is to look it up on the periodic table.

Atomic mass of an element compared with its atomic number

Learn how elements differ from one another in terms of their atomic number and atomic mass now.