Periodic Trends

A measure of the ability of an atom to attract the electrons

Electronegativity is not measured in energy units, but is rather a relative scale

Increase L to R, this is due to an increase in nuclear charge

Electronegativities generally decrease from top to bottom within a group due to the larger atomic size.

One of the ways we can express the size of atoms is with the atomic radius.

Helps us understand why some molecules fit together and why other molecules have parts that get too crowded

The atomic radius is defined as one-half the distance between the nuclei of identical atoms that are bonded together.

Electron configuration notation simplifies the indication of where electrons are located in a specific atom.

refers to the level of reactivity of a metal; Metals tend to lose electrons in chemical reactions.

Metallic character increases as you go down a group

Nonmetals tend to gain electrons in chemical reactions and have a high attraction for electrons within a compound.

The most reactive NM:upper right portion of the periodic table