Periodic TrendNuclear charge

atomic size or

radius

ionization energy

electron affinity

electronegativity

metallic character

Reactivity

bonding

characteristics

crystal configurations

acidic properties

densities

Atomic radius

Periodic Properties 02Atomic Radii 02:

Ions and Ionic Radii

Chapter 06 5

Ions and Ionic Radii

Trend of ionic radiiThe cation of an atom decreases in size while

the anion of an atom increases in size.

The trend can not be made according to the periodic table, but by the isoelectronic series.

The more positive an ion is the smaller it is

because Zeff increases, while the more

negative an ion, the larger it is because Zeff

decreases.

Ionization EnergyDefined as the amount of energy necessary

to remove the outermost electron from an isolated neutral atom in the gaseous state to infinity.

Abbreviation is Ei, it has units of kJ/mol.

IE

Successive ionization energy

Ionization EnergyMinor irregularities in the Ei values are explained

by looking at the electron configurations.

IE Trend

Ionization EnergyIonization energies vary periodically, which is

explained by the changes in Zeff .

Zeff

Electron AffinityElectron Energy: Energy change that

occurs when an electron is added to an isolated atom in the gaseous state.

Abbreviation is Eea, it has units of kJ/mol. Values are generally negative because energy is released.

Value of Eea results from interplay of nucleus electron attraction, and electron–electron repulsion.

EA

Electron Affinity 02

EA Trend

Chemical recativityhttp://www.youtube.com/watch?

feature=player_detailpage&v=uixxJtJPVXk (group 1 reactivity)

http://www.youtube.com/watch?v=u2ogMUDBaf4&feature=player_detailpage (halogen reactivity)

Metallic CharacterThe metallic character of atoms can be

related to the desire to loose electrons

On the periodic table, the metallic character

of the atoms increase down a family and

decreases from left to right across a period.