Multiple Choice
How is the modern periodic table primarily arranged?
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4. Atoms and Elements
Periodic Table: Classifications
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Which element is considered the first in the series commonly referred to as the rare earth metals (lanthanides)?
A
Lanthanum (La)
B
Yttrium (Y)
C
Cerium (Ce)
D
Scandium (Sc)
Verified step by step guidance1
Understand that the rare earth metals, also known as the lanthanides, are a series of elements in the periodic table that have atomic numbers from 57 to 71.
Recall that the lanthanide series starts immediately after the element with atomic number 56, which is Barium (Ba).
Identify the element with atomic number 57, which is the first element in the lanthanide series.
Recognize that this element is Lanthanum (La), making it the first in the series commonly referred to as the rare earth metals.
Note that other elements like Yttrium (Y) and Scandium (Sc) are often associated with rare earth elements but are not part of the lanthanide series itself.
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