Printable Periodic Table With Mass

Updated on Nov 11, 2022
By Printablee Team
Printable Periodic Table With Mass
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Printable Periodic Table with Elements
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Why is atomic mass important to understand?

An element's average atomic mass, expressed in atomic mass units, represents its chemical composition (also known as daltons, D).

The mass of each isotope is increased by its relative abundance to create the average value of the atomic mass for all isotopes of that element. Atomic mass is also known as atomic weight, however, "mass" is a more precise phrase.

Additionally, when combined with the idea of a mole, the atomic mass is helpful in chemistry.

Due to the fact that the nucleus and the internal structure of the atom had not yet been discovered, the first periodic table of the elements, which was first published by Dimitri Mendeleev in 1869, listed the existing elements in order of maximizing atomic weight.

Therefore, the contemporary periodic chart is organized in ascending order of atomic number.

Mass Number: What is it?

The sum of an atom's neutron and proton numbers is known as the mass number. Nucleons are the common name for the aggregate of neutrons and protons. As a result, we may alternatively interpret the mass number as the amount of nucleons in an atom's nucleus.

Typically, we display this number as an integer in the element's left-hand upper corner or superscript.  Due to variations in their neutron composition, different isotopes have varying mass numbers. As a result, an element's mass number indicates the element's mass in integers. The number of neutrons in an element can be calculated from the discrepancy between its mass number and atomic number.

What makes a mass number a mass number?

Most periodic charts also include the element's atomic number and atomic mass in addition to its chemical symbol. Both of them can be mistaken for mass numbers, however neither of them is the same. Nothing about an element's mass is dependent on its atomic number. Counting the protons in every element is all that is required. Each element has a set atomic number. However, the mass number isn't.

It is possible for two atoms of the same element to have different masses. This is due to the fact that an element's neutron content can change. Isotopes are atoms of the same element that contain various numbers of neutrons; every isotope of an element will possess a distinct mass number. Atomic mass, in contrast to mass number, does relate to an element's mass, though unlike mass number, atomic mass is specific towards each element. The weighted average of an element's mass is known as its atomic mass. When calculating an element's average atomic mass, every isotope's mass and its frequency of appearance in nature are taken into consideration.


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How to prevent mixing up atomic numbers and mass numbers?

Make sure you don't mix up the atomic and mass numbers. The atomic number solely counts the protons in an atom, as opposed to the mass number, which accounts for both protons and neutrons.

The atomic number is the number found next to an element's name on the periodic table because it is essential to understanding the identity of the element.

Only when dealing with the hydrogen isotope protium, which has a single proton, do the atomic number and mass number equal. The atomic number of an element does not alter, but rather because there might be numerous isotopes, the mass number may. Keep this in mind while thinking about elements in general.

What distinguishes an atomic number from an atomic mass?

Chemistry can occasionally be somewhat difficult, particularly when learning about elements and atoms and using terminology like atomic mass and atomic number.

These terms are frequently confused by students, who mistakenly believe they can be used simply since they sound very similar. That is a bad practice, though, and it might lead to low marks.

Basically, it's critical to understand the phrases and learn the topics in the proper order, for example, if it's about atomic mass and atomic number.

Atomic mass and an element's atomic number are considered to be directly correlated because every time an element's atomic ratio is too high, it is also said to have a high atomic mass.

What distinguishes atomic mass from atomic number? Let's examine a few crucial distinctions in order to determine the solution.

  • Atomic Mass:


  1. The quantity of neutrons and protons in a specific element's nucleus is known as atomic mass.

  2. It represents an element's typical weight.

  3. Atomic mass can be expressed as A.

  4. It is impossible to categorize an element by its atomic mass.

  5. The classification of various isotopes of the same element is also accomplished using atomic mass.

  6. A majority of measurements of atomic mass are made using this unit (AMU).


  • Atomic Number:

  1. The quantity of protons in an element's nucleus is often indicated by its atomic number.

  2. It refers to how many protons are present in the atom's nucleus overall.

  3. An atomic number is represented by the letter Z.

  4. In order to classify and identify an element, the atomic number is most helpful.

  5. Only their atomic number is shared by isotopes.

  6. A periodic table is organized according to elements' atomic numbers, which are only digits.

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