Which of the following is in the lanthanide family?A) Uranium B) Promethium C) Silver D) Gold
Chemistry · High School · Mon Jan 18 2021
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Among the choices that are given, promethium is the only element that belongs to the lanthanide family.
Uranium belongs to the actinide family, whereas gold and silver belongs to the same metal group, which is group 11. Lanthanides group are elements having an atomic number that span from 51 to 71, hence these elements can be toxic and reactive to other elements.
Final answer:
B.) Promethium