2507
This prediction was supported in 1914 by Henry Moseley who , having discovered that atomic number was an experimentally measurable property of elements , found that a few atomic numbers had no known corresponding elements : the gaps were 43 , 61 , 72 , 75 , 85 , and 87 .
 person: Henry Moseley
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Text: {0} 
Answer:
 person: Henry Moseley