单选题：A There have been many attempts to redesign the periodic tab

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A There have been many attempts to redesign the periodic table since Dmitri Mendeleev drew it up in 1871.
B Railsback has still ordered the elements according to the number of protons they have.
C "I imagine this would be good for undergraduates. "
D Railsback has listed some elements more than once.
E And the size of element's symbol reflects how much of it is found in the Earth's crust.
F The traditional periodic table was well drawn.
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