Hydrogen was recognized as a distinct element by Henry Cavendish in 1776. It is one of the most abundant substances in the Universe.
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[ Teens/Mature Teens ]
Features basic information, an atomic structure diagram, facts and a table of isotopes.
[ Teens ]
Includes physical properties and information about the uses and history of hydrogen.
[ Mature Teens ]
Includes an article with pictures covering properties, applications, history, forms and safety precautions.
[ Teens/Mature Teens ]
Features basic information, an atomic structure diagram, facts and a table of isotopes.
[ Mature Teens ]
Includes an article with pictures covering properties, applications, history, forms and safety precautions.
[ Teens ]
Includes physical properties and information about the uses and history of hydrogen.
