Chemistry, 16.10.2021 01:00, aliay6857

9. This is the only element in the d-block (the middle area of the periodic table) that has not been isolated from the Earth's crust. It derives its name from the fact that it had to be
synthesized by technical means...

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9. This is the only element in the d-block (the middle area of the periodic table) that has not be...