Question

The first longest periodic table contains
- elements with atomic number
to ----- out of these --------
representatives elements, ----
are
transition elements and -- - are inner
transition elements.
are /​

Answer 1

Answer:

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Explanation:

The first of the inner transition series includes the elements from cerium (symbol Ce, atomic number 58) to lutetium (symbol Lu, atomic number 71). These elements are called the lanthanoids (or lanthanides) because the chemistry of each closely resembles that of lanthanum.

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