Which one of the following elements is a Lanthanide
A) U
B) Ce
C) Os
D) Bi
E) Cs

Name: Which one of the following elements is a Lanthanide A) U B) Ce C) Os D) Bi E) Cs
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Question

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Lanthanides are a series of elements with atomic numbers 57-71, and Ce (cerium) has an atomic number of 58, making it a lanthanide. The other choices are not lanthanides. U (uranium) is an actinide, Os (osmium) is a transition metal, and Bi (bismuth) and Cs (cesium) are main group elements.

Which One of the Following Elements Is a Lanthanide