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may 13, 1887 - The english scientist Henry Moseley ( !887 - 1915 ) discovered that atoms of each element contain a unique positive charged

Description:

Henry Mendeleev

Added to timeline:

Jamiyah Polite & Anyliah Middleton

13 Oct 2017

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711

Date:

may 13, 1887

Now

~ 139 years ago

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