Hydrogen+and+Helium

Will S.

Hydrogen and Helium 



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Hydrogen: Nonmetal Symbol: H Atomic number: 1 Atomic mass: 1 Density: 0.09 Description: A gas which is not actually a group. it is also colorless, tasteless, and odorless. very important. the hydrogen atom is the smallest atom known. Atom configuration has 1 proton that is the positively charged and 1 Electron that is negatively charged. Isotopes: hydrogen 1 H, Deuterium 2 H, Tritium 3 H Hydrogen burns in oxygen to form water. < 2 H 2 + O 2 = H 2 O> Boiling point:-253 Degrees C Melting point:-259 Degrees C Freezing point:- 157 Degrees C Hydrogen is not malleable. State at room temperature-Gas Highly Flammable Not Ductile Not very conductive History: Henry Caendish an English chemist discoverd Hydrogen in 1766.

Helium: Symbol: He Atomic number: 2 Atomic mass: 4.002602 Number of protons:2 Number of electrons:2 number of neutrons:2 Description; Light, colorless.odorless gas State at room temperature: gas Melting point:-272 Degrees C Boiling point:-268.2 Degrees C Freezing point:-272 Degrees C Density: 0.1785 g/cm 3 Isotopes: He2 He4 Liquid helium is extremely conductive at high temperatures Not Malleable Not Flammable Does not react with oxygen Used in balloons Not Ductile History: 1868 Pierre J. Janssen and Sir Joseph Lockyer discoverd helium on the sun by using a spectro scope in The United Kingdom.

Both Helium and Hydrogen are noble gases. at one point they were both used in some sort of baloon. Helium was used in party balloon and hydrogen was used in blimps, but since Hydrogen is highly flammable there fore **//exploded//** so they switched from Hydrogen to Helium. Now thoe Helium is still used in baloons and Hydrogen is used in rocket fuel//FUN FACT!!// The sun and all stars are almost 90 Percent helium and hydrogen!!!!!!!!!!!!