Oxygen

We All Need It!

Big image

Basic Information

Symbol: O

Group: 16

Period: 2

Atomic Number: 8

Atomic Weight: 15.9994

Classification: Non-Metal

Description

Oxygen is a colorless, odorless gas.

History

  • Discovered by Joseph Priestly, but also was reported independently by Carl Wilhelm Scheele
  • Comes from Greek words "oxy genes"
  • Air used to be considered as one element, but Leonardo da Vinci suggested it was atleast two, and one was flammable while the other supported life.
  • Behavior of nitrogen and oxygen as parts of air led to the Phlogiston Theory of Combustion

Uses

  • Found in water (H2O) and is necessary for life
  • Makes up most of the weight of water
  • Most organisms use oxygen for respiration
  • About two thirds of the human body is oxygen
  • Widely used for medical purposes

Biology

Oxygen is in water and is used for breathing, both essential to all life.

Geology

  • Makes up 21% of the atmosphere
  • Third most abundant element on the sun
  • In the atmosphere, protects us from harmful UV rays of the sun
  • Involved in the carbon-nitrogen cycle, responsible for stellar energy
  • Most abundant element in the Earth’s crust

Physical Properties

  • Boiling point: -182.9 degrees Celsius
  • Melting point: -218.3 degrees Celsius


Orbital Properties

  • 8 electrons
  • Shell structure is 2.6

Interesting Facts

  • Oxygen as ozone (O3) is highly toxic
  • It causes the bright red and yellow green colors of the aurora
  • Liquid and solid forms of oxygen are pale blue
Big image