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The s orbital is located in the first energy shell (energy shell 1). The electron configuration for a fluorine atom is: F 1s2 2s2 2p5. • An atom of fluorine has a total of 9 electrons, and so all of the superscripts in an electron configuration should add up to 9 (2+2+5 = 9).
How To write an electron configuration: Determine the total number of electrons to be represented. Use the Aufbau process to fill the orbitals with electrons. The Aufbau process requires that electrons fill the lowest energy orbitals first. In another words, atoms are built from the ground upwards.
electrons fill orbitals in order of increasing (n + ) and when two or more subshells have the same ( n + ) value, electrons fill the orbital with the lower n value.
Orbital diagrams are pictorial representations of the electron configuration, showing the individual orbitals and the pairing arrangement of electrons. We start with a single hydrogen atom (atomic number 1), which consists of one proton and one electron.
The electronic configuration of an atom provides information on which orbitals its electrons are in. The Periodic Table below shows how the orbitals occupied by the valence electrons. The number in front of the orbital (1s, 2s, 2p etc) gives the shell (the n quantum number).
The orbital occupied by the 1st and 2nd electrons make up shell one, and the 4 orbitals occupied 3rd by the through 10th electrons make up shell two. As we’ll see, when atoms bond together into molecules, the orbitals change shape and in many cases the orbitals of multiple atoms merge.
Electron configuration. The outermost electrons surrounding an atom (the valence electrons) are responsible for the number and type of bonds that a given atom can form with other atoms, and are responsible for the chemistry of the atom.
