Question

Why is an element's atomic mass not listed as a whole number on the periodic table?
O It represents an average mass of all ions.
O It represents an average mass of all isotopes.
O The mass cannot be determined very accurately,
O The mass can change depending on charge.

Answer 1

Answer: it represents an average mass of all isotopes

Explanation:

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Answer 2

An element's atomic mass is not listed as a whole number on the periodic table because it represents an average mass of all isotopes.

Why aren't the atomic masses of most elements whole numbers?

Most elements' atomic masses are not whole values because they represent a weighted average of the masses of the various isotopes of that element according to their relative abundances in nature.

What are isotopes?

• Isotopes are the variants of chemical elements that possess the same number of protons and electrons, but a different number of neutrons.
• In other words, they have the same atomic number but different atomic masses.
• Example: carbon-14, carbon-13, and carbon-12 are all isotopes of carbon.

Learn more about isotopes here:

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