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.

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

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

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

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

This is because they have a full outer electron shell.

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

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

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