Valence electrons
Ionic bonds deal with the transfer of valence electrons from one atom to another. These are the outermost electrons in an atom's electron cloud.
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metallic
Electrons can escape and move outside of an ion's electron cloud. This can happen through processes like ionization, where an electron gains enough energy to break free from its parent atom. Once free, these electrons can move independently in the surrounding environment.
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Metallic substances have metallic bonds which create an electron cloud in which electrons are highly mobile. Ionic solids have ionic bonding in which electrons are not mobile. Note that by dissolving an ionic substance in water, you can obtain an electrically conductive solution. When dissolved, the ions become quite mobile.
Metals conduct electricity because they have free electrons delocalised through their structure. The bonding in metals is NOT ionic but has been described as a lattice of positively charged atoms, ions, with a cloud of electrons circulating around them.
ionic bond is formed by the complete transfer of electrons
The electrons of an atom are located in the electron cloud.
Electrons are transferred when ionic bonds are formed.
The negative ionic radius is larger than the neutral atomic radius
The electrons in un-ionic or non-ionic bonds occupy space in which at least two nuclear centers are contributing substantially to electrically attracting the electrons, whereas electrons in ionic bonds occupy space centered around a single nucleus as long as the ionic bonds are maintained.