Atomic Mass of Elements - Overview, Structure, Properties & Uses

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

Edited By Team Careers360 | Updated on Jun 17, 2022 05:59 PM IST

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.

Latest: JEE Main: high scoring chapters | Past 10 year's papers

Don't Miss: Most scoring concepts for NEET | NEET papers with solutions

New: Aakash iACST Scholarship Test. Up to 90% Scholarship. Register Now

This Story also Contains

Why do elements have different atomic masses?
The atomic mass of first 20 elements to 30 elements
Atomic mass of an element compared with its atomic number

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.

It is calculated that a mole of sodium chloride (NaCl) would weigh 58.44 formula units (22.9897 amu for Na and 35.453 amu for Cl), which is equal to 58.44 grams. Water (H₂O) has an average mass of 18.02 amu (2x1.00797 amu for H + 15.9994 amu for O) and has an average molecular atomic weight of 18.02 grams.

Also read -

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 Periodic Table of the Element

Also read :

JEE Main Highest Scoring Chapters & Topics

Just Study 40% Syllabus and Score upto 100%

Download EBook

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.

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

Related Topics link

The above table shows the atomic mass of all elements or atomic number of elements from 1 to 30.

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.

NCERT Chemistry Notes :

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.

Atomic mass	Atomic Number
An element's atomic mass is proportional to the number of neutrons and protons that make up its nucleus.	Essentially, the nuclear number is the number of protons within the nucleus of a given element.
A particular element's average atomic weight is referred to as its average.	The number of nucleons present in an atom's nucleus is the number of nucleons in total.
The letter A is used for representing the atomic mass.	Atomic number Z is represented by the letter Z.
Element types cannot be determined by atomic mass.	A chemical element can usually be classified and identified by its atomic number.
Different isotopes of an element are classified according to their atomic masses	An element's atomic number is the same only for its isotopes.
The atomic mass unit (AMU) is always used to measure atomic mass.	For elements to be placed in a periodic table, the atomic number is simply a digit.

Also check-

Frequently Asked Question (FAQs)

1. 1. What is the Definition of Atomic Number?

It is true that even the proton number is referred to as an atomic number. Chemistry defines an element's atomic number as the entire number of protons that make up its nucleus. Due to neutrons' detachment from electrical charge, the charge number reflects the nucleus' charge.

A molecule's mass and atomic number may have similarities, but they each reveal distinctive characteristics of an element. A molecule's atomic mass is also referred to as its atomic atomic weight because it refers to the deliberate composition of the atom.

While its nucleus consists of a nucleus of neutrons and protons, the atomic number does only indicate those numbers.

2. 2. Explain what atomic mass is and give examples?

The fundamental unit of matter is the atom. An element is a substance that cannot be broken down into simpler materials, and atoms are the smallest segments of a chemical element. Chemistry and physics are determined by the properties of atoms.

A key property is their atomic mass.

Atoms generally have a mass equal to the sum of all the atomic weights of their particles. Protons (positively charged particles), neutrons (neutrally charged particles), and electrons (inversely charged particles) are the three basic components of an atom.

The 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.

3. Q3. Amount of mass of the largest atom?

Oganesson

Among all known elements, Oganesson has the highest atomic number and atomic mass. It is not possible to detect more than five (possibly six) atoms of oganesson-294 per year, because the radioactive oganesson atom is so unstable.

4. Q4. Which of the following is the first element?

Atomic mass of hydrogen

A periodic table of elements lists atomic mass of hydrogen as the first element. It consists of a proton in the nucleus and an electron on the outside. Despite its lightness, the gas is highly flammable. Hydrogen is the lightest of all gases.

5. Q5. How do you find calcium's Atomic mass?

A chemical symbol is usually accompanied by atomic mass. Grams per mole (mol) are the units associated with molar mass. In the case of calcium (Ca), its atomic mass is 40.08 g per mole.