Which one of the following blocks of elements is called ‘Representativ

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Which one of the following blocks of elements is called ‘Representative elements’?

s-block elements only
f-block elements only
d-block elements only
p-block elements together with s-block elements
This question was previously asked in
UPSC Geoscientist – 2024
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The s-block elements and the p-block elements together are called ‘Representative elements’ or ‘Main Group elements’.
Representative elements are those where the last electron enters either the s orbital or the p orbital of the outermost shell. They exhibit a wide range of chemical properties and their valencies are generally predictable based on their group number.
The d-block elements are known as Transition elements, and the f-block elements are known as Inner Transition elements (Lanthanides and Actinides). These elements generally have more complex electron configurations and chemical behaviors compared to the representative elements.

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