jan 1, 1914 - Rutherford found protons in the nucleus. Rutherford turned a nitrogen atom to an oxygen atom for the first time. Henry Moseley gave us atomic numbers.
Description:
Rutherford has discovered a lot about atoms. Rutherford's discovery tells us only one element has an equal amount of protons and electrons.
Henry Moseley was an English physicist who gave us atomic numbers. He used the number of protons in that atom to give us that number.
Added to timeline:
The Historical Development of the Period Table
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