The periodic table was arranged by atomic mass ... He used this to calculate the frequency and found that when the square root of this frequency was plotted against atomic number, the graph showed a ...
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Scientists Discovered Promethium in 1945. They Only Just Learned What It Actually Does.The Periodic Table of Elements is a testament to the ... but more importantly it allowed the scientists to fire x-rays and measure the frequencies absorbed, leading to clues about Promethium ...
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