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Grade 11 Chemistry: Unit 1: Matter and Chemical Bonding

Periodic Trends
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Here you will learn about the periodic trends that exist in the modern periodic table.

Periodic Trends: Oxidation States Video

Ionic Radius: Ionic radius increases as you move down a group, and decreases as you move from left to right in a period.
 
Ionization Energy: Ionization energy is the amount of energy it takes to take an electron away from an atom. Therefore, the ionization increases as you move up a group, and decreases as you move from left to right in a period. This is partly due to the fact that it's easier to take electrons away from an atom with a larger radius.
 
Electron Affinity: Electron affinity is the amount of energy an atom is willing to pay to gain an electron. Therefore, we can assume that the electron affinity increases as we move up a group, and increases as we go from left to right in a period.
 
Reactivity: The reactivity increases as you move down a group, and decreases as you move from left to right in a period. Group 1 metals are the most reactive elements, if the trends are true. Especially an element like Cesium, which reacts extremely violently with water.
 
Electronegativity: Electronegativity increases as you move from left to right in a period, and increases as you move up in a group.

Atomic Radius: Atomic radius increases as you move down a group, and increases as you move from left to right in a period.
 
 

Don't forget to check the Web Links section for the extremely useful Periodic Table!