electron configuration

• In an atom, electrons are whizzing around in shells which are numbered as n=1, n=2, n=3, etc.
• The shells have subshells named s, p, d, and f.
• Each subshell is made of orbitals which can hold a maximum of two electrons.
• Atoms have shells, the shells have subshells, the subshells have orbitals, and the orbitals contain electrons.
• The first three shells are n=1, n=2, n=3.
• The n=1 shell has only s orbital and can hold two electrons.
• The n=2 shell can hold eight electrons and has an s and three p orbitals.
• The n=3 shell can hold 18 electrons and has an s, three p, and five d orbitals.
• Fluorine has nine electrons and its electron configuration is 1s2 2s2 2p5.
• In the n=1 shell of fluorine, the first shell fills up first with two electrons and then the s orbital is filled up down.
• In the n=2 shell of fluorine, the s orbital is filled up first and then the up electrons are filled up down.
• In the n=3 shell of fluorine, the s, three p, and five d orbitals are filled up.
• The electrons in a p sub shell can occupy up and down states, and the configuration can be represented as up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up, down, up,