Why is atomic number better than atomic mass for organizing the elements in the periodic table?

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07-11-2016
Chemistry

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Why is atomic number better than atomic mass for organizing the elements in the periodic table?

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SJ2006 SJ2006 · Answer 1 · 2016-11-07T17:16:47+01:00

SJ2006 SJ2006

07-11-2016

It is because they increases linearly due to adding of 1 proton at each step.

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ajinems ajinems · Answer 2 · 2021-12-07T12:37:04+01:00

The atomic number is better than atomic mass because

the atomic number defines the element given and always remains the same for each elements.

All atoms of the same elements have the same number of protons in their nuclei.

Atomic number of an element is the number of protons (which is also the number of electrons) contained in one atom of the element.

For example the element chlorine contains 17 protons, therefore, it's atomic number is 17. This number doesn't change.

Atomic mass number is the total number of protons plus the number of neutrons.

The number of neutrons in the atoms of the same element may differ.

This is why only atomic number can be used in arranging elements in the periodic table. Difference in number of neutrons will give rise to difference in mass number.

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