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why do some elements have decimals in their mass number

by Delaney Homenick DVM Published 3 years ago Updated 2 years ago

why do all atomic masses have decimals if there are some elements that only have one isotope? Atomic masses are the weighted average of all the isotopes of the element; hence, the atomic mass is always in decimal form as a fractional average.Apr 6, 2016

Full Answer

Why do all the atomic masses have decimals?

If the reason the atomic masses have decimals is because of this weighted average, then it should follow that the monoisotopic elements should have a whole-number mass. Therefore, why do all the atomic masses have decimals? Show activity on this post. This is a simple question which has a complicated answer.

Why do the atomic masses of monoisotopic elements have decimal numbers?

If the reason the atomic masses have decimals is because of this weighted average, then it should follow that the monoisotopic elements should have a whole-number mass. Therefore, why do all the atomic masses have decimals?

Why is atomic mass never an integer?

Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.

What determines the mass of an atom in the periodic table?

The Periodic Table of the Elements is strictly organized by Atomic Numbers, which dictate how one atom interacts or bonds with another atom. If the table also gives a figure for Atomic Mass, then that is merely an AVERAGE of the mass that is usually found within such atoms on this planet.

Why is mass number a whole number?

When you give a mass number, you are counting the nucleons in a particular atom. That has to be a whole number because you can’t have fractional protons or neutrons. When you give an Atomic Weight, you are giving a weighted average of the various isotopes of that atom.

Why isn't atomic mass given as a whole number?

The atomic mass is not given as a whole number because it is a weighted average taken of all of an atom's isotopes found in nature relative to the mass of carbon-12. The measurement unit used for atomic mass is the unified atomic mass that has the symbol "u.".

How do you determine an atom's identity?

An atom’s identity is defined by its atomic number (number of protons). But atoms of the same element can have a variety of isotopes (atoms which have the same number of protons, but differ in the number of neutrons in their nuclei).

What is the atomic weight of an element?

The atomic weight of an element is a weighted average of the atomic masses as a number of daltons of each isotope, with the weighting being the relative abundance of each isotope. Being a number of daltons, the value of the atomic weight is just a number with no unit of measurement.

Why isn't every atom of an element the same?

The reason for atomic mass not being a whole number is because atomic mass is reported as a weighted average of all the isotopes.

What is the mass of an atom in atomic units?

The mass of an individual atom in atomic mass units is the mass relative to carbon-12. Only carbon-12 has a mass exactly equal to itself. Even the mass of a single proton (1.00727661 u), or neutron (1.00866520 u) is not a whole number.

What is the standard atomic mass?

So, the standard of atomic mass is carbon-12, and this has a mass of 12.00, so the unit of mass is one-twelfth of this. The atomic mass is not given as a whole number because it is a weighted average taken of all of an atom's isotopes found in nature relative to the mass of carbon-12.

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