This is because they have a full outer electron shell.

An electron shell is the outside part of an atom around the atomic nucleus.

The heavier noble gases have more electron shells than the lighter ones.

Generally, the product nucleus has a different atomic number, and thus the configuration of its electron shells is wrong.

The sets of orbitals with the same n value are often referred to as electron shells or energy levels.

The matter in the interior is degenerate, the electron shells of its atoms collapsed by the pressure.

Some new X-ray radiation is generated from the inner electron shells of the atoms.

The diagrams show electron shells of six of the lighter elements.

Replies: A noble gas is an element with its outer electron shell completely filled.

The different sub orbits of electron shells was discovered by experiments in chemistry.

However, after approximately element 120, the proximity of the electron shells makes placement in a simple table problematic.

The definition was later revised to include compounds with similarly reactive electron shells.

There is no such equivalence, however, for ionized or excited states with open electron shells.

Groups of electrons were thought to occupy a set of electron shells about the nucleus.

The electrons are distributed among various "electron shells," according to a system we can,accept without de- tailed explanation.

"Next you'll be claiming that it keeps track of the quantum spin states in our electron shells.

Members of the noble gas family have filled s and p orbitals in their outermost electron shell.

A new row (period) is started when a new electron shell has its first electron.

Atomic physics studies the electron shells of atoms.

Some properties of europium are strongly influenced by its half-filled electron shell.

An atom's electron shells are filled according to the following theoretical constraints:

The group has been able to study the detailed structure of electron shells in the atoms by forcing them to resonate with laser light.

Blocks 4 groupings (colors) by elements' outermost electron shell configuration.

This leaves vacancies in the electron shells.

It was the electron shells - this consequence of Pauli - that gave the atom its chemical properties.