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The complete history of the Universe -- from the Big Bang to 200 my into the future

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Oxygen

An oxygen atom has six electrons in its outer shell, so there are two holes. By forming two covalent bonds, and so sharing two electrons with other atoms, it is able to fill its outer shell and give itself a hard outer shell.

In models oxygen atoms are usually colored red.

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

eBook only $2.99
398 pages, 300 images

"I find the science fabulous...an extremely useful teaching tool."
Professor David Christian

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