Atomic Mass of Elements: You can find the atomic mass of elements list below. If you want to remember the atomic mass of the elements, here’s a useful list of elements by atomic mass. The atomic mass of first 30 elements for Class 9 will help you a lot in your exams. This page also includes the common valencies of the first 30 elements for quick revision. For more Class 9 study resources, you can also explore the latest resources on Topper’s Social Science.
Atomic Mass and Valency of First 30 Elements
The table below gives the names, symbols, atomic numbers, approximate atomic masses and common valencies of the first 30 elements. It is useful for Class 9 Chemistry revision and for learning how atomic number and valency are related.
| Element | Atomic Number | Atomic Mass | Common Valency |
|---|---|---|---|
| Hydrogen | 1 | 1 | 1 |
| Helium | 2 | 4 | 0 |
| Lithium | 3 | 7 | 1 |
| Beryllium | 4 | 9 | 2 |
| Boron | 5 | 11 | 3 |
| Carbon | 6 | 12 | 4 |
| Nitrogen | 7 | 14 | 3 |
| Oxygen | 8 | 16 | 2 |
| Fluorine | 9 | 19 | 1 |
| Neon | 10 | 20 | 0 |
| Sodium | 11 | 23 | 1 |
| Magnesium | 12 | 24 | 2 |
| Aluminium | 13 | 27 | 3 |
| Silicon | 14 | 28 | 4 |
| Phosphorus | 15 | 31 | 3, 5 |
| Sulfur | 16 | 32 | 2, 4, 6 |
| Chlorine | 17 | 35.5 | 1, 3, 5, 7 |
| Argon | 18 | 40 | 0 |
| Potassium | 19 | 39 | 1 |
| Calcium | 20 | 40 | 2 |
| Scandium | 21 | 45 | 3 |
| Titanium | 22 | 48 | 2, 3, 4 |
| Vanadium | 23 | 51 | 2, 3, 4, 5 |
| Chromium | 24 | 52 | 2, 3, 6 |
| Manganese | 25 | 55 | 2, 4, 7 |
| Iron | 26 | 56 | 2, 3 |
| Cobalt | 27 | 59 | 2, 3 |
| Nickel | 28 | 58.7 | 2, 3 |
| Copper | 29 | 63.5 | 1, 2 |
| Zinc | 30 | 65 | 2 |
Atomic Number and Atomic Mass of the First 30 Elements
Atomic number and atomic mass are two different properties of an element. Understanding the difference between them is important before learning atomic structure and chemical formulae.
What is Atomic Number?
The atomic number is the number of protons present in the nucleus of an atom. In a neutral atom, the number of electrons is also equal to the atomic number.
What is Atomic Mass?
Atomic mass represents the relative mass of an atom. It is based mainly on the combined contribution of protons and neutrons in the nucleus.
Atomic Number vs Atomic Mass
| Term | What it tells us | Example |
|---|---|---|
| Atomic Number | Number of protons present in the nucleus | Hydrogen = 1 |
| Atomic Mass | Relative mass of an atom, mainly related to protons and neutrons | Carbon ≈ 12 |
| Symbol | Short representation of an element | Hydrogen = H |
What is Valency?
Valency indicates the combining capacity of an element. It is related to the number of electrons an atom loses, gains or shares while forming chemical compounds.
Common Valencies of the First 30 Elements
Some elements have more than one common valency. Therefore, while revising the table, pay particular attention to elements such as nitrogen, phosphorus, sulfur, chlorine and several transition elements.
Nitrogen, phosphorus, sulfur, chlorine, titanium, vanadium, chromium, manganese, iron, cobalt, nickel and copper can show more than one common valency. The exact valency depends on the compound and the chemical context.
How to Revise the First 30 Elements
Memorising 30 elements becomes easier when you divide the information into small groups instead of trying to learn everything at once.
Download Atomic Mass of Elements PDF
Save a printable revision copy of the atomic masses and valencies of the first 30 elements for quick exam preparation.
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Frequently Asked Questions
The atomic masses of the first 30 elements range from about 1 for hydrogen to about 65 for zinc. The complete reference table is provided above.
Atomic number is the number of protons present in the nucleus of an atom. In a neutral atom, it is also equal to the number of electrons.
The common valencies of the first 30 elements are given in the main table above. Some elements can show more than one common valency.
Atomic number identifies an element through its number of protons, whereas atomic mass represents the relative mass of its atoms.
Several elements, particularly some transition elements and elements such as nitrogen, phosphorus, sulfur and chlorine, can show more than one common valency.
Learn the elements in groups of ten and revise their symbols, atomic numbers, atomic masses and common valencies together. Regular self-testing makes recall easier.