# Atomic Mass of 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.

## 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.

 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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#### 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

Q1

### 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’.

Q2

### 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.

Q3

### 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.

Q4

### 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.

Q5

### 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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