Atomic Mass of First 30 Elements

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

Given below is a table that lists the first 30 elements based on atomic number and their corresponding atomic mass.

ATOMIC NUMBER	ELEMENT	ATOMIC MASS
1	Hydrogen	1.008
2	Helium	4.0026
3	Lithium	6.94
4	Beryllium	9.0122
5	Boron	10.81
6	Carbon	12.011
7	Nitrogen	14.007
8	Oxygen	15.999
9	Fluorine	18.998
10	Neon	20.180
11	Sodium	22.990
12	Magnesium	24.305
13	Aluminium	26.982
14	Silicon	28.085
15	Phosphorus	30.974
16	Sulfur	32.06
17	Chlorine	35.45
18	Argon	39.948
19	Potassium	39.098
20	Calcium	40.078
21	Scandium	44.956
22	Titanium	47.867
23	Vanadium	50.942
24	Chromium	51.996
25	Manganese	54.938
26	Iron	55.845
27	Cobalt	58.933
28	Nickel	58.693
29	Copper	63.546
30	Zinc	65.38

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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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.

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