Chalcogens

1. Chalcogens By: Alexis Smith Allison Luberto Todd Brosky

2. History • The name chalcogen was proposed by a man named Werner Fischer. • Chalcogen comes from Greek words which translates to chalkoswhich means “copper” • It’s direct translation means “copper-former” • Chalcogen was first used by Wilhem Biltz Research Group at the University of Hannover in Germany.

3. Reactions • These elements gain two electrons to form doubly charged negative ions which has the stable electronic configuration of it’s nearest neighboring noble gas. • When they reach they could have odors if it is close to an electric motor. • Many reactions happen due to oxygen in the gas form.

4. Common Uses • Oxygen: Used by any living thing in order to breathe. Found in earths crust. • Sulfur: Manufactured for fertilizers. • Selenium: It’s a semi-conductor that’s sensitive to light. • Tellurium: Used for tinting glass. • Polonium: Used in anti-static brushes to remove negatives and prints.

5. Similar Properties • All elements in this group are chemically active and have 6 electrons in their outer electron shell. • They all are found in either free or combined states. • All melting, boiling, and densities increase going down the group. • Ionization energy decreases going down the group.

6. Properties • All these elements physically vary from each other. • Oxygen: Clear and colorless • Sulfur: Yellow and powdery • Selenium: Gray and round • Tellurium: Dark in color and rock like • Polonium: Dark in color and shiny