Sunday, June 12, 2011

Trends in the Periodic Table

There are many trends in the period table for you to predict a property of an element, and in this post I'm going to talk about four of them.

Atomic Radius

Atomic radius is the mean distance between the centre of the nucleus to the boundary of the electron clouds. It increases as the group number decreases, and increases as the periodic number increases.

Ionization Energy
Ionization energy is the amount of energy that is needed to remove an electron from an atom. It increases as the group number increases, and increases as the periodic number decreases.

Electron Affinity 
Electron affinity is the change of energy when one electron is added to an atom. It has the same trend as ionization energy.
**note: this does not apply to noble gases, as the electron affinity of noble gases is unknown

Electronegativity
Electronegativity is the ability for a nucleus to attract electrons.  It has the same trend as ionization energy and electron affinity.

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