Xe Number Of Valence Electrons

Chemical science 2

Valence Electrons

Valence electrons are those electrons that are in the highest principle energy level. It is these electrons that primarily interact with other atoms.
1. Oxygen has 6 valence electrons: 1s² 2s²2p⁴
2. Sodium has i valence electron: 1s^two2s²2p^half-dozen 3s^ane
3. Bromine has vii valence electrons: 1s²2s²2p⁶3s²3p^six 4s² 3d¹⁰ 4p⁵
4. Xenon has viii valence electrons: 1sⁱⁱ2s²2p⁶3sⁱⁱ3p⁶4s^two3d¹⁰4p⁶ 5s^two 4d¹⁰ 5p⁶
5. Selection 2 elements from whatsoever column and determine how many valence electrons those atoms accept. You should discover a particular pattern.
Experimental evidence shows us that atoms are most stable when they have full s and p orbitals (8 valence electrons) in their highest principle free energy level.
Ane unproblematic piece of evidence for this is the Noble Gases which form the last column on the right of the periodic tabular array. All of these elements have viii valence electrons in their highest principle energy level. 1 exception is He which has a full principle energy level with 2 electrons.
If atoms don't have 8 valence electrons (or 2 if they are close to He), then they will react with other atoms in order to take eight valence electrons. This tin can be done past either sharing electrons betwixt atoms, taking electrons from other atoms, or giving electrons away to other atoms.
Basically, atoms are about stable when they can reach an outer electron construction like to the closest Element of group 0.
The periodic table can be divided into two broad groups:
1. Metals (low ionization energy and low electronegativity)
2. Non-Metals (high ionization free energy and loftier electronegativity)
If ii atoms are going to bond together nosotros have three possible categories:
1. metal/metal
2. metal/non-metallic
3. nonmetal/nonmetal
Kinds of bonds that can form
1. If we take a metal/metal or a nonmetal/nonmetal pairing then each atom in the pair will have a like electronegativity and ionization energy every bit the atom it is bonded with. In that situation the atoms volition attract the other's electrons with about the same force, and information technology will take a like amount of energy to remove an electron from each atom.
2. When both atoms in the pair have a similar pull on the other'southward electrons (electronegativity) and resist the removal of an electron (ionization energy) in a similar fashion, then they volition share electrons forming a covalent bond.
3. If we take a meta/nonmetal pairing then the nonmetal cantlet will pull strongly on the metal's weakly held (depression ionization energy) electron and the metal atom volition not pull very strongly (low electronegativity) on the strongly held (high ionization energy) electrons of the nonmetal atom.
4. When there is a large imbalance of electronegativity and ionization energy between atoms, an ionic bond will grade.
The valence electrons will make up one's mind how many electrons are shared or transferred between atoms.