Change: Hydrogen is the third most abundant element. It is also the most simple; it has only one proton, one electron, and one neutron.Hydrogen is the most abundant element in the Galaxy, also is the lightest element.   View changes from previous version. (Word count: 316)

Change: hydrogen,hydrogen, Compounds of hydrogen are often called hydrideshydrides. My Story~I am discovered by the lovely gentleman Henry Cavendish, in 1766. He was the one who recognized me even   View changes from previous version. (Word count: 293)

Change: Hydrogen compounds are those chemical compounds which contain hydrogen My Story~I am discovered by the lovely gentleman Henry Cavendish, in 1766. He was the one who recognized me even though   View changes from previous version. (Word count: 286)

Change: eV,eV, which is equivalent to an ultraviolet photon of roughly 92 nm.nm. My Properties My Home(Body, Planet, Universe) I am Element!Hydrogen is the most abundant element in the Galaxy, also is the   View changes from previous version. (Word count: 277)

Change: Electron configuration 1s1 Electrons per shell 1 My Properties My Home(Body, Planet, Universe) I am Element!Hydrogen is the most abundant element in the Galaxy, also is the lightest element. It is also the most abundant, constituting roughly 75% of the universe's elemental matter. My Compounds(My Friends!) My   View changes from previous version. (Word count: 250)

Change: Hydrogen is the most abundant element in the Galaxy, hydrogen is the lightest element. It is also the most abundant, constituting roughly 75% of the universe's elemental matter My Compounds(My Friends!) My Story~I am discovered by the lovely gentleman Henry   View changes from previous version. (Word count: 243)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 214)

Change: ~Hydrogen atom which has no neutrons and only 1 proton and 1 electron. Why no neutrons? There is only one proton and thus a neutron is not needed to stop the nucleus from falling part due to repelling nature of protons. My Electrons My Properties My Home(Body, Planet, Universe)   View changes from previous version. (Word count: 214)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 173)

Change: ~I am very useful on Earth, do you know i am used in your everyday live? over 9 million tons of hydrogen are produced in the U.S. each year and 3.2 trillion cubic feet are used to make many common products My Video~ Watch Make Hydrogen   View changes from previous version. (Word count: 173)