Periodic Trends Worksheet (Page 9 of 18) in pdf

Periodic Trends Worksheet Page 9

Honors Chemistry - Michalek

Unit 06 Periodic Trends

Unit 06 – Periodic Trends

NAME: ______________________

Discussion Sheet 6b – Ionization Energy, Electronegativity, and Electron Affinity

The degree to which an atom holds onto its outermost electrons can also be determined based on its location in the periodic table.

This hold a nucleus has on its outermost electrons can be expressed in three ways:

The electronegativity of an atom is the tendency for atoms of an element to attract electrons when they are chemically bonded to

atoms of another element.

The ionization energy is the amount of energy required to remove an electron from an atom to make a positive ion.

The electron affinity is the tendency for an atom to take hold of an electron in order to form a negative ion.

The differences between these three things is nuanced, depending on what the atom is, and what type of chemical bond it will form (or

has formed). As should be expected, this trend is exactly the opposite of the radius trend, as summarized by the following table.

As with atomic radius, an up/down move in the periodic table is a much more important change in ionization energy,

electronegativity, or electron affinity than a left/right move.

Periodic Trends Worksheet Page 9