mass number
nucleon number

"But the scouts have been reporting mass numbers of men moving north for three days now!"

There are no stable atoms with mass numbers 5 or 8.

He had simply retreated in the face of massed numbers.

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

But alas, the mass numbers that once rallied to them are long gone.

In this process, the mass number increases by one.

So you're able to write code that just does mass number crunching.

Its 41 isotopes have mass numbers ranging from 108 to 148.

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

When rounded it gives a mass number of 56.

The isotopes of plutonium range in mass number from 228 to 247.

Did you know that there are 17 isotopes of sodium having mass numbers from 19 to 34?

"How do you support your network costs while attracting a mass number of users?

The binding energy per nucleon increases with mass number up until nickel-62.

You have some very upscale companies here that are interested in reaching mass numbers."

Through calls from a mass number of lonely and isolated youth it quickly became apparent to him that support was needed.

The mass number of this isotope was not clearly established (possibly 258 or 259) at the time.

For nobelium 11 isotopes are known with mass numbers 250-260 and 262.

Note that the curve against mass number is smooth.

The mass number is also the amount of protons and neutrons added together.

Thus, the mass number remains the same and the atomic number increases by 1.

Isotopes of a chemical element differ only in the mass number.

The mass numbers are tearing the country's immigrant absorption system at the seams.

They may vary in number and erupt in mass numbers.

So,they are not in mass numbers here but always have been noted for their bravery and nobleness.

For light nuclei with total nucleon numbers 1 to 6 only those with 5 do not show some evidence of stability.

The mass number, also called the nucleon number, is the number of protons and neutrons in an atomic nucleus.

The nucleon number (mass number) is shown in the left superscript position (e.g., N)

The fusion of two nuclei that create larger nuclei with lower atomic numbers than iron and nickel-a total nucleon number of about 60-is usually an exothermic process that releases more energy than is required to bring them together.

O. Haxel, J. Hans D. Jensen, H. E. Suess Concerning the Interpretation of "Magic" Nucleon Numbers in Connection With the Structure of Atomic Nuclei, Die Naturwissenschaften Volume 35, 376 (1948)

And, since we are using the value of 12 for the mass of an atom of 6C12 (Carbon), and since that number also has an amount of remaining free energy, The mass number of the atoms of the other elements varies around the nucleon number and can be more or less than that value.