atomic mass
atomic weight

For example, the atomic mass of copper is about 63.55.

The same argument could be made against "relative atomic mass" used in this sense.

As any artificial element, a standard atomic mass cannot be given.

Each atom in the sample has a "particular" atomic mass.

In particular, reaction rates are very slightly affected by atomic mass.

Sections for the same element are then ordered by atomic mass number.

However, because oxygen-17 and oxygen-18 are also present in natural oxygen this led to 2 different tables of atomic mass.

The atomic masses of these isotopes range from 112 to 151.

For other similar sounding terms, such as relative atomic mass, see the article on that subject.

Since promethium does not exist in nature, a standard atomic mass cannot be given.

The loss of energy to the outside world results in a decrease of atomic mass.

Thus, you can imagine that the average atomic mass of N is skewed very close to 14.

We first need the energy equivalent of one atomic mass unit:

And you say then : well, the average atomic mass of Calcium is 40,078.

The uncertainty in the atomic mass may exceed the stated value for such specimens.

At least 10 nuclear isomers have been described, ranging in atomic mass from 66 to 84.

No element was found to have a stable isotope with an atomic mass of five or eight.

When grouped by properties, most elements had increasing atomic masses, but some were out of order.

The huge table provides the basics plus full element names and atomic masses.

His periodic table had the form of a spiral and the elements where placed into the structure according to their atomic mass.

For atomic mass spectrometry, a sample must also be ionized.

Samples of these elements therefore may serve as reference standards for certain atomic mass values.

Many tables have the atomic weight and not the atomic mass.

Because of its low atomic mass, it also has a high charge- and power-to-weight ratio.

She was among the first persons to discover radon and to try to determine its atomic mass.

Lead has a higher atomic weight than gold, but is far more common.

Do you have a better explanation of a atomic weight?

His major work, however, was that on the atomic weights of the elements.

Atomic weight 7.0 So called from having been discovered in a mineral.

I am sorry but you are making some confusion with atomic weight and mass number.

Based on this, in 1828, he created a table of relative atomic weights.

I would think that the whole stability thing was directly related to atomic weight.

He arranged the chemical elements according to their atomic weight.

The elements are ordered by atomic weights that were known at the time.

He is notable for his work on atomic weights of the elements.

Those based directly on the atomic weight of the isotope.

His chart included 63 known elements placed in order of atomic weight.

Compare this with iodine, which has an atomic weight of 127.

He pointed out that some of the atomic weights being used at the time were incorrect.

Note that the atomic weight of gold is known with more precision than for silver.

Its atomic weight is apparently on the order of twelve hundred."

But occasionally, they have an extra neutron, giving them an atomic weight of 13.

He saw that the similar elements occurred at regular atomic weight intervals.

These atomic weights had shortly before been suggested by Dalton.

Magnesium, atomic weight 24.312, was lighter by a third than aluminum.

They were numbered sequentially to show the order of atomic weights.

Replies: The usual way is to measure the atomic weight of the element.

Those based on the small differences in chemical reaction rates produced by different atomic weights.

These products are themselves radioactive elements, each with an atomic weight a little lower than its predecessor.

It was becoming clear that atomic weights are not constants of nature.