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Question:

What is the best way to rewrite sentence 8, reproduced here: "The periodic table of elements have both columns and rows."

A The periodic table of elements has both columns and rows.
Explaination

Although elements ends in an -s, the "periodic table of elements" is a singular noun, so it needs a singular verb. And, since the table has been around and probably isn't going anywhere anytime soon, the appropriate tense would be present.