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What is the most likely reason that Mendeleev placed tellurium before iodine?

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Answer:

Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass.

Step-by-step explanation:

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User Purrsia
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Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass is the most likely reason.
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User Dlinsin
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