The valence electrons are the electron that recognize the most usual bonding fads for an element.

These electrons are uncovered in the s and also p orbitals of the highest power level for the element.

Sodium #1s^2 2s^2 2p^6 3s^1#Sodium has 1 valence electron from the 3s orbital

Phosphorus #1s^2 2s^2 2p^6 3s^2 3p^3#Phosphorus has actually 5 valence electrons 2 from the 3s and 3 from the 3p

Iron #1s^2 2s^2 2p^6 3s^2 3p^3 4s^2 3d^6#Iron has actually 2 valence electrons from the 4s

Bromine #1s^2 2s^2 2p^6 3s^2 3p^3 4s^2 3d^10 4p^5#Bromine has 7 valence electron 2 native the 4s and also 5 indigenous the 4p

Also, valence electron is the electron in the out many shell of one atom. Ns hope this was helpful.SMARTERTEACHER

Answer attach

Anthony F. · Christopher P. · · Ernest Z.
may 12, 2014

Valence electrons space the outermost electrons and also are therefore at the highest power level.

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Because they are the outermost energy levels, castle are accessible to participate in chemistry bonding, either ionic or covalent.

The alkali metals have one valence electron in your highest energy level.

The electron construction for lithium is #1s^2 2s^1#

Since the highest energy level because that lithium is 2 and also it consists of one electron, the valence number because that lithium is one.

Fluorine has a configuration of #1s^2 2s^2 2p^5#.

The highest energy level because that fluorine is 2 and also this energy, it has 2 electrons in the s orbital and 5 electron in the p orbital.

The total of valence electron in the 2nd energy level for this atom is 7 (2+ 5).

It is energetically favorable because that lithium to lose one electron i beg your pardon is acquired by fluorine.

As a consequence, lithium repurchase a + 1 charge, if fluorine acquires a -1 charge.

These ions attract one one more and form an ionic bond.

See more: How Many Feet Is 169 Cm In Feet? What Is 169Cm In Feet And Inches

In summary, valence electrons determine the bonding patterns of atoms.

Here is a video which discusses exactly how to draw Lewis frameworks for atoms mirroring their number of valence electrons. Video from: Noel Pauller