K shell (or 1s orbital).
a
A noble gas, such as helium or neon, is unreactive and has a full outer electron shell on the periodic table. This full outer shell makes them stable and less likely to form chemical bonds with other elements.
There are 5, it is in group 5 on the periodic table of the elements
The noble gases in Group 18 of the periodic table have a full outer shell of electrons, making them stable and chemically unreactive.
electrons
5 because it is in group 5 on the periodic table
Potassium has one electron on its outer shell. It belongs to group 1 of the periodic table, so it has one electron in its outermost shell.
Iridium has 2 electrons in its outer shell. It belongs to group 9 in the periodic table, which means it has 9 electrons in its valence shell.
the first ring has two second has ten and third has eight
The first period of the periodic table's elements all have 1 energy level.
There are 8 electrons in the outer shell of a xenon atom. Xenon is in group 18 of the periodic table, which means it has a full octet of electrons in its outer shell.
The shell model explains the organization of the periodic table. The elements in the first period have electrons in the first shell; the elements in the second period have electrons in the first two shells; the elements in the third period have electrons in the first three shells; and so on.