atomic number
proton number

The result is an element with atomic number two less than before.

There is therefore no use considering the atomic numbers of 118 and beyond.

As of 2010, elements with atomic numbers 1 to 118 have been observed.

It has the chemical symbol He and atomic number 2.

"What are the basic structure and the atomic number of an atom?"

Even as of today, nearly a century later, we have driven the atomic number up to only a shaky 106.

Each list is arranged in order of decreasing atomic number.

But gold's place in the periodic table (and thus its atomic number) was known to be 79.

The result of the emission is a new element with a lower atomic number.

This makes two completely different elements with smaller atomic numbers.

Human technology has produced various additional elements beyond these first 98, with those through atomic number 118 now known.

They have the atomic numbers between 89 - 103.

It has an atomic number of 4 and is symbolized by the letters Be.

When the atomic number increases, the element have different properties.

The exceptions occur more often as the atomic number increases.

An alternative definition of the effective atomic number is one quite different to that described above.

The quest for new elements is usually described using atomic numbers.

For large atomic number A this potential is similar to a potential well.

It has an atomic number in excess of four hundred, for example."

This number is known as the atomic number of the element.

Boron, with its atomic number of 5, is a very light element.

Until these experiments, atomic number was not known to be a physical and experimental quantity.

In this process the atomic number rises by one.

My technicians tell me metals will be rated in value as per their atomic number.

It is atomic number 40 on the periodic table.

It is the proton number that gives the element its identity.

Various theories have suggested that the next magic proton number is 114, 120 or 126, he said.

In beta decay, the proton number increases by one.

In contrast, the proton numbers for which there are no stable isotopes are 43, 61, and 83 or more.

After 1932, therefore, an element's atomic number Z was also realized to be identical to the proton number of its nuclei.

The symbol for argon is Ar, and its atomic number (or proton number) is 18.

Nuclides that have the same neutron number but a different proton number are called isotones.

Nickel is to the right of cobalt, since its proton number (28) is higher by one than that of cobalt (27).

Still other possible beryllium isotopes have even more severe mismatches in neutron and proton number, and thus are even less stable.

The proton number (atomic number) may be indicated in the left subscript position (e.g., Gd)

They are arranged with increasing atomic numbers (proton numbers) from left to right and increasing neutron numbers from top to bottom.

In fission there is a preference to yield fragments with even proton numbers, which is called the odd-even effect on the fragments charge distribution.

This placement is consistent with the modern practice of ordering the elements by proton number, Z, but this number was not known or suspected at the time.

Bremsstrahlung: This is radiation given off by the electrons as they are scattered by the strong electric field near the high-Z (proton number) nuclei.

Because positron emission decreases proton number relative to neutron number, positron decay happens typically in large "proton-rich" radionuclides.

By adding a proton to a nucleus, the element is changed because the chemical element is defined by the proton number of a nucleus.

Chemical properties are primarily determined by proton number, which determines which chemical element the nuclide is a member of; neutron number has only a slight influence.

For a positron decay and also for an alpha decay (see below), the oblique arrow would go from right to left since in these cases, the proton number decreases.

Under conditions encountered in astrophysical environments it is difficult to obtain p-nuclei through proton captures because the Coulomb barrier of a nucleus increases with increasing Proton number.

Rutherford realised that if an atom is losing protons, its identity is changing at the same time, since an atom's identity is governed by its proton number.

But with that exception, all elements with proton numbers greater than the 92 of uranium must be made in laboratories, and with Element 114, 21 artificial elements have been made.

A set of nuclides with equal proton number (atomic number), i.e., of the same chemical element but different neutron numbers, are called isotopes of the element.

Nuclear isomers are members of a set of nuclides with equal proton number and equal mass number (thus making them by definition the same isotope), but different states of excitation.

Two nuclides are isotones if they have the very same neutron number N, but different proton number Z. For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones.

Of particular note is Ubh-310, which would be "doubly magic" (both its proton number of 126 and neutron number of 184 are thought to be magic) and thus the most likely to have a very long half-life.