Period 2 element

The second period of the periodic table of the elements contains all the chemical elements that have exactly two electron shells in the atom. The innermost (first) electron shell is fully occupied and has two electrons. The outermost (second) electron shell, also called valence shell, can accommodate between one and eight electrons, so there are also eight chemical elements in the second period.

Excerpt from the Periodic Table

Magic Number

The chemical element oxygen with atomic number eight has in the ground state of the nucleus is more stable than neighboring nuclides. This particular order number is called the magic number.

Number of electrons in the electron shells

List

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8

• Group of the periodic table
• Period 2 element