What percentage of the electricity used in the united states is produced by hydroelectric power plants?
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Ответ:
Ответ:
Explanation:
It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals.