Oxygen

Oxygen: =﻿ ﻿It was discovered by Joseph Preistly in 1774. The name oxygen comes from the greek words oxus (meaning acid) and gennan (meaning generate). The symbol of oxygen is O and it came from being the first letter of its name. = = = =Atomic number:8 = =Atomic mass:15.9994 amu (atomic mass unit) = =Number of protons:8 = =Number of neutrons:8 = =Number of electrons:8 = =State of matter: gas (at room temperature) = =Melting point: -218.4 °C (-361.12 °F) = =Boiling point: -183.0 °C (-297.4 °F) = =Density: 0.001429 grams per cubic centimeter = =Abundance in Earth's Crust: 46.6% = =How is it useful: It substains life, it is needed by every cell in your body, and all animals need it to. Also it is the element that plants let go after photonsynthesis (a process at which carbon dioxide into oxygen, by plants and algae). Also it is one thing that fire needs to keep going, that is why when you put a cup over a flame it goes out when all the oxygen is used up. It also can make things burn very fast. = =<span style="font-family: Arial,Helvetica,sans-serif;">Interesting facts: = =<span style="font-family: Arial,Helvetica,sans-serif;"> and protons): 2 = <span style="font-family: Arial,Helvetica,sans-serif;"> =<span style="font-family: Arial,Helvetica,sans-serif;">Sources: = []  []  []  []
 * 1) =<span style="font-family: Arial,Helvetica,sans-serif;">Obtained from liquid air =
 * 2) =<span style="font-family: Arial,Helvetica,sans-serif;">Colorless: When a gas =
 * 3) =<span style="font-family: Arial,Helvetica,sans-serif;">Pale blue: When a liquid =
 * 4) =<span style="font-family: Arial,Helvetica,sans-serif;">Period Number (the number of electrons, neutrons, =
 * 1) =<span style="font-family: Arial,Helvetica,sans-serif;">Group Number (the row it is in): 16 =
 * 2) =<span style="font-family: Arial,Helvetica,sans-serif;">Group Name: Chalcogen =
 * 3) =<span style="font-family: Arial,Helvetica,sans-serif;">Classification: non metallic =
 * 4) =<span style="font-family: Arial,Helvetica,sans-serif;">Most abundant element in the earth =
 * 5) =<span style="font-family: Arial,Helvetica,sans-serif;">Oxygen can also be combined with acetylene (C <span style="font-family: Arial,Helvetica,sans-serif; vertical-align: sub;">2 <span style="font-family: Arial,Helvetica,sans-serif;">H <span style="font-family: Arial,Helvetica,sans-serif; vertical-align: sub;">2 <span style="font-family: Arial,Helvetica,sans-serif;">) to produce an extremely hot flame used for welding =
 * 6) =<span style="font-family: Arial,Helvetica,sans-serif;">Liquid oxygen, when combined with liquid hydrogen, makes an excellent rocket fuel =
 * 7) =<span style="font-family: Arial,Helvetica,sans-serif;">Oxygen as its gas form is colorless, tasteless, and ordorless =
 * 8) =<span style="font-family: Arial,Helvetica,sans-serif;">The liquid form is paramagnetic (has unpaired electrons) =
 * 9) =<span style="font-family: Arial,Helvetica,sans-serif;">Oxygen is also in the tank that you use when you go scuba diving =