3, three, tres
stable
some elements have unusual atomic orbitals
filled energy sublevels
In krypton atoms, the 3s and 3p sublevels are filled, i.e. 3s23p6.
Lyman's series
Atoms, like Neon (Ne), that have the s and p sublevels filled with either electrons are said to have an "octet" of electrons.
some elements have unusual atomic orbitals
filled energy sublevels
In krypton atoms, the 3s and 3p sublevels are filled, i.e. 3s23p6.
Lyman's series
The first 3 energy levels are filled, the 4s and 4p and 4d sublevels are filled, and the 5s and 5p sublevels are also filled. So only the first three energy levels are completely filled. The fourth and fifth energy levels are partly filled. The electron configuration is 1s22s22p63s23p63d104s24p64d105s25p6 or [Kr]4d105s25p6.
Because their outermost energy level is only partially filled, some elements are highly reactive, I believe.
Atoms, like Neon (Ne), that have the s and p sublevels filled with either electrons are said to have an "octet" of electrons.
p-block elements have partially filled p-subshell. It is not completely filled.
All the noble elements to the far right of the periodic table have their s and P sublevels in their valence shell filled, hence they are nonreactive.
reactive
The elements that have highest occupied s and p sublevels partially filled are called the representative elements. These include Groups I and II and the last six groups on the right of the periodic table.
only five filled sublevels