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by lacoleyoung
Last updated 5 years ago

Chemical Elements

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Atomic Number:1Atomic Mass:1.00794 u ± 0.00001 uMelting Point:-434.5°FBoiling Point:-423.2°FNumber of Protons/Electrons:1 Number of Neutrons: 0Classification:alkaline metal Color:red

Hydrogen Symbol: H

HISTORYIn 1671, Robert Boyle discovered and described the reaction between iron filings and dilute acids, which results in the production of hydrogen gas. In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".

CHEMICAL PROPERTIESAt standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H 2. Hydrogen is also prevalent on Earth in the form of chemical compounds such as hydrocarbons and water.

PHYSICAL PROPERTIESUSES OF HYDROGEN. It is a colorless, tasteless and odorless gas. It is highly inflammable and burns with blue flame forming water. Bond energy of H-H is 431 Kj/mole.

SOCIETAL APPLICATIONSis used daily as a gas and liquid by many industries, including the petroleum industry and in manufacturing processes for producing chemicals, foods and electronics. Towngas, a fuel used in the early part of the 20th century, was 50% hydrogen. Hydrogen is used as a fuel for the NASA space shuttle.


Atomic Structure


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